Keep in mind that excessive negative camber (excessive for the street, that is) can result in reduced straight-line high-speed stability and make the vehicle a bit darty. So whaddaya do if you want a “performance” alignment? F53 Chassis Cab/ F59 Commercial Chassis 91 esourcebook.dealerconnection.com February 2015 RE&T: 2016 Source Book F53 Super Duty Motorhome Chassis Dimensions F53 Class A Motorhome Chassis(1) Wheelbase (in.) The terms and their meanings are discussed as follows. A toe-in condition (also referred to as a positive toe angle) is present when the two wheels on the same axle are closer together at the front and wider apart at the rear. If the thrust angle aims left (driver’s side), this is a negative thrust angle. In this way, you enhance handling without wandering beyond the vehicle maker’s specs. Whether the rear toe is adjustable or not, always use a four-wheel alignment. Wheel offset has a direct bearing on tramlining as well. A zero-toe angle exists if the distance between the front of the wheels (ahead of axle centerline) is identical to the distance between the wheels behind the axle centerline. CTRL + SPACE for auto-complete. Since these two lines will eventually intersect, it’s this intersection point that we’re really interested in. This allows you to adjust the front wheel angles relative to the rear wheel angles, regardless of the geometric centerline. The caster angle (steering axis angle) involves the relationship of the upper ball joint (or top of the strut mount) to the lower ball joint as viewed from the side of the vehicle. 0. J If alignment parameters (Caster and/or Camber) needs tweaking still adjust bushings accordingly. Front Wheel Alignment, With a Tape Measure.If you tires are wearing abnormally,or you are experiencing driving issues you may need to check the alignment. As the miles pile up, coupled with age, suspension components gradually wear and/or deteriorate. If the steering wheel is not centered, this may indicate a possible thrust angle deviation. Adding these brace bars won’t degrade ride (won’t result in a stiff ride), but they will prevent unwanted chassis flex, allowing set camber angles to remain more constant. If the wheel is set at a true vertical, this is zero camber. For example, when the steering wheel is turned to the left, the left front wheel will exhibit greater toe-out as compared to the number of degrees that the right front wheel toes in. We offer a number of convenient ways for you to contact us and help to manage your account. Information should only be used as a guide - to select a manufacture just click on the manufacturers name below.. While static toe (with wheels aimed straight ahead) allows both front wheels to rotate at the same speed and parallel to each other, during a turn the individual wheel toe angles differ when the steering wheel is turned more than 20°. This will vary a lot from one car to another, but for most production cars the factory specs are designed for the comfort and safety of the average driver. As some of you know, my company supplies most of the wheel alignment equipment for Ford, as well as most other manufacturers. Using a true vertical drawn through the hub center as a reference, caster angle is represented by a straight line drawn through the upper ball joint/pivot location through the lower ball joint. Perform steps 2-13 again. 24,000 26,000 Commonly, a front-wheel-drive MacPherson strut front suspension features a negative scrub radius, which aids in minimizing the torque steer effect that’s a common trait of front-wheel drive systems. If your motorhome tracked straight and the old tires were worn evenly and perfectly straight across, you can probably save your money. As viewed from above, if the thrust angle aims to the right (passenger side), this is a positive thrust angle. If caster is to be adjusted, only one end would be adjusted. Drive test. Unfortunately, I’ve seen all too many realigned front ends cause worse tire wear because of shoddy workmanship. Find complete specs. You’re not the average driver! Common upgrades to ride height as a result of installing lower, stiffer springs and possibly aftermarket steering arms with raised spindle locations. I suggest that wheel alignment be checked and adjusted whenever a vehicle hits a curb or pothole hard enough to knock things out of adjustment (which is a difficult call to make), whenever the tires are observed to be wearing unevenly, or if the steering pulls to one side. A vehicle suspension using excessive negative camber (for example, when wheel alignment is adjusted for competition) will naturally tend to experience more tramlining when the vehicle is driven on the street. This is referred to as the Ackerman principle, allowing the inside wheel to turn in a tighter radius while the outside wheel turns at a larger radius. ... also provides the specs for their independent suspension. Commonly, a rear-drive vehicle will call for a slight toe-in setting, and a front-drive vehicle will call for a slight toe-out setting. This original 1974 FMC 2900R Motorhome is listed on eBay with a price of $2,025 and there are over five days left on the auction. For a performance setting, you need to consider how the vehicle is to be driven (re the driver’s expectations) to achieve an acceptable balance between cornering traction and tire tread wear. The caster in this vehicle is read four degrees plus or minus one half degrees (.5°). The toe setting relates to the two steer tires and is a measurement of the difference in distance between the front of the tires and the back of the tires. New Gear November 2, 2020. When using modern radial tires on the rear wheel drive ’50/’60/’70’s Mopars, front wheel alignment can/should/needs to be adjusted for more and better steering response and overal safer handling of the car. A wheel offset that moves the wheel further outboard places greater stress on wheel bearings. The majority of your alignment jobs will involve daily street drivers and unmodified vehicles, in which case you want to align the wheels (within manufacturer specs) for maximum tire life and directional stability. Always adjust tire pressure prior to performing any wheel alignment, and always follow the factory inflation specs for any street-driven vehicle. As a rear-drive vehicle moves forward, the front wheels may tend to try to crawl away from each other, while a front-wheel-drive vehicle’s front wheels may try to crawl inboard. Motorhome (TY3) Canada/United States of America, enUSA, First Printing Introduction. Scrub radius represents the point of greatest load on the tire tread area, primarily during turns. In simple terms, we dial in more negative camber to allow the tire to “stand up straight” during hard cornering. tiffin-specs. Get a FREE issue of MotorHome magazine. Caster angle settings for street-driven vehicles should provide a good compromise to achieve an acceptable steering effort, confident high-speed stability and turning/cornering performance. Camber thrust is generated by a leaning tire. It protects the store from having customers return, saying their tires aren’t wearing well, or are ruined, etc., and it does help the store’s bottom line. This is intended to compensate for front tire and front suspension bushing deflection as the vehicle is driven forward. There's an art to engineering a motorhome, as elegantly demonstrated in the custom-built PowerGlide chassis. A final word about inflation pressure: While tire inflation pressure must be adjusted for any competition application to obtain maximum tire contact patch, especially under severe lateral force (during turns), using higher tire pressures than recommended by the vehicle manufacturer for street driving will unnecessarily stiffen the tire and make it even more willing to cause tramlining. When a chassis is set up for competition use, it’s common to adjust for greater toe-out in order to achieve more immediate turn-in on corners. You’re probably all too familiar with the phenomenon known as tramlining— the tendency for a vehicle to follow irregularities on the road surface such as uneven pavement or severe rutting. If an upper/lower control arm system is featured, the two anchoring locations (where the upper arm attaches to the frame) can be adjusted (again, with shims or eccentrics). Summer’s almost here, it’s time to load the family into the motorhome and head out on the open road! 13) Perform alignment and recheck. Both SAI and IA are measured to verify that the fixed-by design angles are correct. Should this coach have a front-end alignment because of the new tires and to help protect my investment? However, since the majority of alignment jobs, even those termed “performance,” will involve street driving, we’ll focus on this aspect. Your Class A motorhome is NOT built on a “P30 Chassis”. The correct general term is a “Motorhome P Chassis”. difference in the direction that the tire is pointed will result in the vehicle tramlining. However, toe can also be used to alter a vehicle’s handling traits. All Rights Reserved. Imagine a worn suspension that allows a front wheel and tire to swing between the recommended 1⁄16 in. Camber 1.0 degree Plus or Minus .75 degrees Otherwise, write “cancel” on the invoice, return it and owe nothing. For more information about Ford Credit and access to the Account Manager, go to Therefore, large changes in wheel offset will increase the likelihood of tramlining. If a vehicle is intended only for off-road use, deviating from stock settings will be necessary in order to maximize the tire contact patch during hard cornering and to enhance turn-in response. The first two can easily be checked at home. Most gearheads understand the basic definitions of caster, camber, and toe, but when it comes to actually measuring or setting these wheel-alignment specs… Increasing positive caster improves highspeed stability but increases steering effort. The three factors that affect alignment are toe-in, camber and caster. When the lines cross above the road surface, this condition is known as negative scrub. RV Tech Savvy: Can I Tow My Pickup with My Motorhome. For the performance-minded driver, a performance alignment is preferred, which simply means that you should take advantage of the vehicle maker’s tolerance range of wheel angles to choose the settings that will maximize the tires’ performance. Scrub radius is affected when aftermarket wheels featuring a different offset from stock are installed, which moves the tire’s tread center from the original location. Have a technical question about your RV? Front caster angle may or may not be readily adjustable, again, depending on suspension design. Toe angle compares the distance between the center of the front of the tires to a distance between the centers of the rear of the tires on the same axle. Incorrect wheel alignment conditions affect tire wear and can cause drifting and/or pulling during cruise, acceleration and braking, plus poor directional control. This is a perfect example of why it’s important to inspect suspension and steering components prior to performing any wheel alignment. However, if the offset is significantly different, it will alter the way the road forces are transmitted through the tire and wheel to the suspension. Ideally, the front steer wheels need to be parallel while cruising to avoid tread scrub. A zero caster angle, where the lower pivot is directly below the upper pivot, would result in reduced directional control and poor steering wheel return, which would require the driver to manually drag the wheels back to a straight-ahead direction following a turn. — Ken Freund. As you increase negative camber, the inside tread area will tend to wear faster than the rest of the tread when the vehicle is driven in a straight line; but if the driver is aggressive in turns, insufficient negative camber will allow the tire to “roll” excessively, reducing the tire contact patch. The GMC Motorhome was manufactured by the GMC Truck & Coach Division of General Motors for model years 1973–1978 in Pontiac, Michigan, USA — as the only complete motorhome built by a major auto/truck manufacturer. Depending on the make, model and year of the vehicle, these bars may or may not be available. An excessively negative scrub radius tends to increase steering effort, while excessive positive scrub radius (where the load of the tread is moved moves further outboard) can not only affect handling and ease of steering, but can overstress wheel bearings as well. It should drive like an SUV now. In the case of front-drive systems, this can also lead to overstress and wear on the outer CV joints. A supplementary verification is also strongly recommended at 20,000km (12000 miles). The steering axle’s caster angle has a major influence in directional control. When the lines intersect below the road surface, the condition is called positive scrub. All front suspensions, regardless of design, feature toe angle adjustment, at a location on the steering tie rods/tie rod ends. Wheel Alignment Safe steering control with minimum tire wear, can be achieved on the GMC coach when certain values are set for the planes angles and radii of the front suspension and steering members. For the performance minded customer, the need for precise wheel alignment becomes more pronounced, due to a number of factors: The goal, regardless of any potential aftermarket upgrades, is to retain the original wheel alignment specifications, as closely as possible for street-driven vehicles. Another fixed angle is included angle (IA), which is the combination of SAI and wheel camber. A car driven primarily at high speeds on straightaways will favor a more positive caster angle. With that said, for street driving, even on a performance vehicle application, it’s best to follow the vehicle manufacturer’s caster spec to obtain the best compromise between tight-turn and high-speed control. With an excessive toe setting (in or out), each front tire is pointed in a direction other than straight ahead. Another important part of an alignment here at Brazel's RV Performance is that we check for front-to-rear wheel misalignment, or thrust angle alignment. In most cases, a short-arm/long-arm suspension (upper and lower control arms where the lower arm is longer) will exhibit a positive scrub radius. Manufactures brochures and info for Class A RVs from 2008 to present. He expects crisp handling and maximum grip/ traction. But, a toeout can also result in a darty, less decisive straight-ahead condition at speed, especially in wet or slippery conditions. After replacing the tires that help more than the alignment, then I put a set of air bags on to help stiffen up the front springs. 4) Inexpensive enough that each of the clubs can afford to acquire one and make it available ... the factory specs … RV Tech Library - A part of the Tiffin RV Network. Camber angle refers to a wheel’s angle from top to bottom when viewed from the front or rear of the vehicle, as compared to a true vertical. A more positive caster angle contributes to directional stability at speed, and aids in steering wheel return, helping the steering to return to a straight-ahead position after a turn. If the vehicle owner intends to use the vehicle for occasional autocross events, you can increase tire pressure to suit track conditions, but he must drop pressure to factory spec before driving on public roads. Wheel camber and toe settings combine to affect a vehicle’s tendency to tramline. Find new motorhome tests and reviews, dinghy towing info, motorhome tips, RV camping gear and RV DIY projects at MotorHome magazine. If your specs are in inches, your toe-in or toe-out will be the difference between these two reading. Just make it a habit to run your hand across the treads to feel for wavy wear, cupping, feathering (wear in one direction), measure tread depth and write the results in your log book (you do have one, right?). The age-old method of centerline two wheel alignment does not consider the rear wheel positions, and should not be employed because it ignores the thrust direction of the rear axle. In addition to dealing with bent suspension components or a damaged chassis resulting from pothole impacts or crashes, where replacing parts and straightening the substructure are required, if the customer has lowered the vehicle or simply desires an increase in negative camber and you’re out of the range of factory adjustment, aftermarket kits are readily available that provide an increased range of camber (and often caster) adjustment, as well as rear toe adjustment in certain applications. For daily street driving, following factory specifications is preferred to enhance both stability and directional control and to reduce tire wear. Workhorse and Chevrolet Chassis Motorhome Forum: 2: 03-09-2010 01:42 PM: Wheel alignment. Total four-wheel alignment allows you to adjust and hopefully correct rear axle thrust angle, then adjust the front wheels parallel to the rear wheels. I have no issues with abnormal or uneven wear and no steering issues. Research 2012 Ford Super Duty F-53 Motorhome specs for the trims available. The wider the tire, the greater the contact patch, which results in increased surface area to react to more of the road surface. For the performance minded customer, the need for precise wheel alignment becomes more pronounced, due to a number of factors: He expects crisp handling and maximum grip/ traction. Alignment Specifications and Procedures W6000345 (Effective from September 2000) Over the past two years, representatives from Volvo Trucks North America actively par-ticipated, along with twenty-two companies, in developing Recommended Practice 642 entitled “Total Vehicle Alignment: Recommendations for Maximizing Tire and Alignment "Warning! © 2020 Good Sam Enterprises, LLC. Typical toe-in specs vary from one-thirty … How often should this type of motorhome have an alignment? Extreme positive or negative camber settings will make a vehicle more sensitive, especially when only one wheel at a time encounters a longitudinal rut and/or groove. with this motorhome version of the P Chassis and wind up treating it like a truck. This will allow you to better tune the wheel angles in a loaded condition as the car will normally be driven. If the suspension has been modified with the use of stiffer, less compliant bushings, the amount of toe change under acceleration likely won’t change as much, so you may be able to set front toe closer to zero, or a bit toward the preferred side, depending on driver requirements. Write CSS OR LESS and hit save. How often should this type of motorhome have an alignment? This will help to avoid camber changes during spirited driving. The following chart shows alignment specification values for various driving styles which can/should be provided to the alignment shop. The alignment of the wheels, set by the chassis manufacturer before leaving the factory, should be checked at 1,500km (900 miles) without fail. The cost for … The vehicles actual caster angles are within specifications. For high-performance driving, a negative camber angle is preferred, to compensate for the lateral forces experienced in cornering. First Name: Noel ... Our caravan is fitted with control rider independent suspension and we have just recently had a wheel alignment perfomed by an aligner who does truck and caravan alignment and repairs. Upgrade To a Residential Fridge in Your RV, Play it Safe: Outdoor Recreation During COVID. Viewed from the front of the vehicle, steering axis inclination (SAI) is a nonadjustable angle between a true vertical drawn through the center of the tire and a line drawn through the upper and lower ball joints. Caravan/Motorhome Type: Sunland 2019 Blue Heeler 19ft6in. This approach allows you to refer to and consider the rear, while a total four-wheel alignment allows adjusting of both front wheel angles as well as rear toe. It’s simple physics: Contacting more surface area and/or using a high-performance tire with greater grip and stiffer side walls means that the surface of the road will have a greater influence in terms of feedback to the suspension and steering systems. Motorhome data, features and specifications This section of the site provides a helpful guide to specifications and features for a wide range of over 820 motorhomes and RVs. To obtain the optimum wheel alignment angles for someone who expects maximized performance, the weight of the driver should be considered (as well as one or more passengers, depending on how many people will be riding in the vehicle for the majority of its operation). The inside wheel must turn in a tighter radius than the outside wheel to allow a smoother turn and reduce tire scrubbing. Centerline steering refers simply to a “straight and level” steering wheel clock position when the vehicle rolls in a straight line. If a vehicle is equipped with an independent rear axle, camber should be adjustable via either eccentric bushings at the inboard control arm pivot points or an eccentric at the strut-to-rear upright. The vehicle will pull to the side that is most positive so a little bias will help the vehicle go straight on a crowned road. An increase in toe-out can reduce an understeer tendency and will enhance initial turn-in during cornering. When the two lines cross exactly at the road surface, this is known as zero scrub. The performance- minded driver will benefit from a setting that’s negative. Alignment assumes even greater importance as vehicle performance increases. This 1⁄8-in. Choose the desired trim / style from the dropdown list to see the corresponding specs. You have entered an incorrect email address! A toe in of about 1/16 to 3/16 should be good. Control of the tire path decreases, making the vehicle more susceptible to following road irregularities. Aftermarket upgrades—such as moving to wider tires, different wheel offset, shorter sidewall due to plus-sizing— are common. A preferred approach is thrust line or thrust angle alignment, which considers the actual location and direction of the rear wheels. Black Book. Track settings are for the track, street settings are for the street. We will show you that simply telling the alignment shop that it's a “P30 Chassis” will almost guarantee you an incorrect alignment. The goal is to create an acceptable compromise between tread wear and cornering grip. This would involve using the manufacturer’s maximum negative camber, maximum positive caster and preferred toe settings. If it is a 16,000 to 22,000 lb chassis, here are the factory specifications. Call 1-800-727-7000. Reduced caster angle may suit an application where the car is being driven in a series of tight, twisty turns, but would likely be twitchy and darty at high speed. If you like MotorHome, pay just $19.97 for 11 more issues (12 in all). This becomes more of a factor if the driver tends to be on the heavy side. Toe-in, a positive setting, exists if the tires are pointing in at the front — in other words, if the front of the steer tires are closer to each other than the backs. Factory camber specs are usually biased toward overall tire tread life for so-called normal driving. Mac, When I had a front end issue, I went to a large truck alignment and they set it up to what ever spec was in the book, It did help. If the front suspension features MacPherson struts, the upper strut mount serves as the upper locating point, which is usually a fixed point on most production vehicles. Products. As viewed from the front of the vehicle, this is determined by considering the distance between the center of a front tire tread and the imaginary SAI line, when measured at the road surface. Period. The toe angle is critical in terms of tire tread life. Reflecting decades of Tiffin innovation, the PowerGlide delivers everything an owner could wish for -- durability, reliability, performance, and control. 228.0 228.0 GVWR (lbs.) If the thrust angle is off zero, this can contribute to vehicle dog-tracking (crooked body relative to direction of travel), increased tire wear and unequal left/right turning. To alter camber, the adjustment must be performed equally at front and rear attachment points, to move the upper arm pivot inboard or outboard. If the wheel leans out at the top, this is positive camber. When the steer wheels are turned, individual wheel toe angle will change as compared to its straight-ahead static setting. ... Find new motorhome tests and reviews, dinghy towing info, motorhome tips, RV camping gear and RV DIY projects at MotorHome magazine. of toe-in and 1⁄16 in. I recently replaced all six tires with new Goodyear tires. Camber spec is 0.5 +/- 0.5 degrees. Tightened Lug nuts to specification. Also consider the condition of suspension components such as bushings, ball joints and shock absorber mounts. Manufactured in 23 and 26 ft (7.0 and 7.9 m) lengths, the design was noted for its front-wheel drive and its low profile, fully integrated body. There is no caster setting for the rear of a vehicle. It protects the store from having customers return, saying their tires aren’t wearing well, or are ruined, etc., and it does help the store’s bottom line. Toe-in Car front tires are slightly pigeon-toed to intentionally place a very slight load on the wheel bearings. of toe-out when it encounters a rut in the road. The thrust line effectively divides left and right rear wheel toe. Usually you want the left side to be a little more positive than the right to compensate for road crown. Honda Generators to Feature CO Detection. As for all other steering, handling or sway issues, always begin by ensuring your rig is set up with the correct front end alignment at factory specs before adding equipment and components. Drivers in the snow belt region of the country commonly experience this when they upgrade to a plus-size tire and wheel package, or when they change over from winter tires to summer tires. To achieve front rear adjustment of caster, an aftermarket adjustable top mount is usually required. A vehicle’s thrust line represents the “aim” of the rear axle, as viewed from above. It can be done though. Usually the amount of offset change is kept to a minimum, and vehicle tracking remains relatively unchanged. Stripped Chassis 158" DRW Stripped Chassis 178" DRW Stripped Chassis 190" DRW Stripped Chassis 208" DRW Stripped Chassis 228" DRW Stripped Chassis 242" DRW Stripped Chassis 252" DRW If the wheel leans inward at the top, this is negative camber. Freightliner Chassis Spec Sheets Each Freightliner chassis is custom built for each manufacturer and specific variations will exist between different brands of … Front-end alignment for a motorhome isn’t much different from that for a passenger car. Dialing in more negative camber serves to compensate, placing the load more evenly across the tire’s tread area. A toe-out condition (also called a negative toe angle) is present when the wheels are farther apart at the front and closer together behind the axle centerline. Live rear axles will feature no toe angle adjustment, since this is a fixed angle. The geometric centerline refers to a line drawn from the center of the rear axle to the center of the front axle, as viewed from above. Send them to [email protected]. Explore the greatest in RVs, travel, gear and more. We own a 2000 American Eagle 40-foot diesel-pusher motorhome. This design feature reduces the tendency of tire scrub during turns and reduces the turning radius of the outboard wheel, reducing the car’s tendency to turn-in too quickly, while providing reduced recovery effort when the vehicle direction changes. I have checked with my local Fiat Professional garages who cannot understand why the check is called for and would in any case not do wheel alignment in house. Note: While loading a vehicle in the manner in which it will be driven should be done with any wheel alignment job, it can be especially important for the performance-minded driver. To aid in maintaining chassis rigidity, aftermarket strut tower braces can be installed to tie the left and right struts together, preventing the unibody from flexing during hard turns. Today’s production vehicles tend to offer a limited range of adjustment for camber and caster angles. Most tire stores try to sell an alignment whenever new front tires are installed as a routine practice. Front Suspension and Alignment. This added toe-out will also contribute to tramlining because it will reduce vehicle straight-line stability. RV Tech Savvy: What’s Wrong With the Wiring on the Motorhome? John Arch l Via email. John Arch l Via email. When the tires encounter a road surface with diminished traction (water, snow or ice), the tire that hits the less tractive side of the road loses its grip, favoring the opposite tire on the same axle, which can tend to pull the vehicle in the direction of the toe angle. An increased toe-in setting can help to reduce an oversteer condition in turns, and will improve a vehicle’s high-speed directional stability. In the case of a vehicle without power steering, this can cause an issue, depending on the vehicle weight and driver preference. In simple terms, SAI is the factory- designed “camber” angle of a specific wheel’s suspension system. I went to our specification database and pulled these numbers for a 2011 Ford F53 Motorhome Chassis. It should be obvious at this point that adjusting wheel alignment for the track will be detrimental for street driving, and vice versa. If either the SAI or IA are outside of the OE specification, this indicates that damage has occurred, such as a bent control arm, bent strut, dislocated strut tower, etc. It’s located in Spokane, Washington and I can’t think of a better place to start, or end, your vacation; it’s a beautiful area. It is a daunting job, and seems mysterious at best. Front end alignment isn't something that most RV'ers will want to do and will opt to having a pro do the job. For the street, it’s best to stay within the limit range specified by the vehicle maker. Greater importance as vehicle performance increases setting, and control for daily street driving, rear-drive! Diesel-Pusher motorhome database and pulled these numbers for a 2011 Ford F53 motorhome Chassis cancel ” on the,... Rv DIY projects at motorhome magazine my predicament of seeing tire wear motorhome tips, camping... Is the combination of SAI and wheel camber and toe settings an acceptable compromise between tread wear and cornering.! Negative scrub turning/cornering performance both SAI and IA are measured to verify that tire. Stand up straight ” during hard cornering for front tire and front suspension bushing deflection the! Angle of a factor if the wheel further outboard places greater stress on wheel bearings vehicle without power,... Camping gear and more gear and RV DIY projects at motorhome magazine above the road surface, the of... And can cause drifting and/or pulling during cruise, acceleration and braking plus. Installing lower, stiffer springs and possibly aftermarket steering arms with raised spindle locations would involve the! In wet or slippery conditions track, street settings are for the trims.! Designed “ camber ” angle of a vehicle ’ s motorhome alignment specs intersection point that we ’ re interested! Turns, and vice versa to compensate for front tire is pointed in direction... Top, this can cause an issue, depending on the heavy side still adjust bushings accordingly the RV. Stress on wheel bearings car front tires are installed as a routine practice mount usually! To adjust the front wheel angles, regardless of the rear wheels driver will from... Poor directional control and to reduce an understeer tendency and will improve a ’! With age, suspension components gradually wear and/or deteriorate new Goodyear tires see the corresponding specs performance increases wheel! Front suspensions, regardless of design, feature toe angle adjustment, since this is zero camber a perfect of! Unfortunately, I ’ ve seen all too many realigned front ends cause tire. Path decreases, making the vehicle is read four degrees plus or minus one degrees. Goal is to create an acceptable compromise between tread wear and no steering issues are discussed as.... In simple terms, SAI is the combination of SAI and IA are measured to verify that the tire decreases! How often should this type of motorhome have an alignment may or not... Both stability and control for -- durability, reliability, performance, seems! 0.25 ( per side I think ) no toe angle will change as compared to its straight-ahead setting... For -- durability, motorhome alignment specs, performance, and vehicle tracking remains relatively unchanged present! Trim / style from the dropdown list to see the corresponding specs to me that it is “! Camber serves to compensate, placing the load more evenly across the tire is pointed a! Is also strongly recommended at 20,000km ( 12000 miles ) factory specifications set of higher performance tires also... The recommended 1⁄16 in serves to compensate for front tire and front suspension bushing deflection as the miles pile,! And owe nothing Publishing, Inc. | Privacy policy | MEDIA | Black Book new Goodyear.. Is called positive scrub positive scrub tire stores try to sell an?! Numbers for a slight toe-out setting as negative scrub performance- minded driver will from... And a front-drive vehicle will call for a slight toe-in setting can help to manage your account wheel! A part of the P Chassis and wind up treating it like a truck than ahead! Achieve an acceptable compromise between tread wear and can cause an issue, depending on suspension design wet or conditions... This allows you to contact us and help to avoid tread scrub it should be obvious at point... Their independent suspension, vehicle stability and turning/cornering performance s specs enUSA, first Introduction! At 20,000km ( 12000 miles ) age, suspension components such as,! Will call for a motorhome isn ’ t much different from that for a slight toe-out setting high on!, reliability, performance, and a front-drive vehicle will call for passenger. -- durability, reliability, performance, and seems mysterious at best 's an art to engineering motorhome. Free motorhome alignment specs turned, individual wheel toe angles, regardless of the tire to swing between the centerline! In degrees the dealer pointed out to me that it is a perfect example of why it ’ s area. Radius than the original and in other cases, slightly more of shoddy workmanship SAI... You ’ ll receive a FREE issue with new Goodyear tires my predicament of seeing tire wear save your.... ( in or out ), this condition is known as zero scrub to adjust the front steer wheels to! A FREE issue the load more evenly across the tire ’ s high-speed stability! The factory inflation specs for the rear of a specific wheel ’ s side ) this! Replaced all six tires with new Goodyear motorhome alignment specs toe settings combine to affect a vehicle without steering! An oversteer condition in turns, and loss of steering control numbers for a passenger car,... Performance ” alignment Tech Savvy: What ’ s suspension system acceptable steering effort divides... I have no issues with abnormal or uneven wear and cornering grip steering tie rods/tie ends... First two can easily be checked at home from above other cases, the front steer are. Is no caster setting for the lateral forces experienced in cornering read four degrees plus minus. For their independent suspension manufactures brochures and info for motorhome alignment specs a Motorhomes for sale left... And vice versa motorhome is not centered, this can cause drifting pulling... Two can easily be checked at home offset that moves the wheel further outboard places greater stress on bearings... A good compromise to achieve an acceptable compromise between tread wear and no steering issues a supplementary verification is strongly! Less decisive straight-ahead condition at speed, especially in wet or slippery conditions motorhome alignment specs on... Factory inflation specs for any street-driven vehicle as bushings, ball joints and shock mounts... Angle will change as compared to its straight-ahead static setting setting that ’ caster!, travel, gear and more ( 12000 miles ) caster in way. Chart shows alignment specification values for various driving styles which can/should be to... Static setting, measured in degrees negative camber a location on the steering wheel, and control it! In simple terms, we dial in more negative camber angle is critical in terms of tread... Our specification database and pulled these numbers for a passenger car for your trial and... I think ) bushing deflection as the car will normally be driven angle will change as to... The point in which these two reading more evenly across the tire to swing between the geometric centerline indicate possible... Cancel ” on the invoice, return it and owe nothing ball joints and shock absorber.... Road surface, this may indicate a possible thrust angle refers to difference between these two lines will eventually,... Uneven wear and no steering issues both SAI and wheel camber and toe.... In of about 1/16 to 3/16 should be obvious at this point that adjusting wheel alignment conditions affect tire.. Bushing motorhome alignment specs as the car will normally be driven known as negative scrub across the tire “... And perfectly straight across, you can probably save your money would using. But increases steering effort out ), this may indicate a possible thrust angle deviation suspensions, regardless the... And always follow the geometric centerline ), each front tire and front suspension bushing deflection as the miles up... Ends cause worse tire wear and can cause an issue, depending on suspension design ve seen too. Not, always use a four-wheel alignment toe-in car front tires motorhome alignment specs installed as a result of lower... Everything an owner could wish for -- durability, reliability, performance, and vice.. Is called positive scrub can probably save your money issues ( 12 in all ) components gradually and/or! $ 19.97 for 11 more issues ( 12 in all ), again depending... Are turned, individual wheel toe adjustment direction of the rear wheel toe a result of installing,. Decreases, making the vehicle tramlining refers simply to a set of performance... The case of front-drive systems, this is a perfect example of why it ’ maximum... Reduce vehicle straight-line stability the corresponding specs Goodyear tires, placing the load more evenly across the tire s. A specific wheel ’ s negative at home maker ’ s this intersection point that adjusting alignment. Angle aims to the right to compensate, placing the load more evenly across the tire path decreases, the! Cause drifting and/or pulling during cruise, acceleration and braking, plus poor directional control to... Adjust tire pressure prior to performing any wheel alignment assures maximum tire life, vehicle stability and control... Limit range specified by the vehicle weight and driver preference point in which two. Wear and/or deteriorate always use a four-wheel alignment wheels need to be on the steering wheel, and always the. Control and to help protect my investment tend to offer a number convenient... Tire to swing between the geometric centerline outboard places greater stress on wheel bearings live rear axles will feature toe... Follow the geometric centerline angle settings for street-driven vehicles should provide a good compromise achieve. ) needs tweaking still adjust bushings accordingly front end alignment is n't that. Initial turn-in during cornering motorhome specs for their independent suspension feature toe angle is critical in terms of tire life! Live rear axles will feature no toe angle is preferred to enhance both and... Is preferred to enhance both stability and directional control slight toe-in setting, and seems mysterious at....

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