Write CSS OR LESS and hit save. 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. CTRL + SPACE for auto-complete. 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. Get a FREE issue of MotorHome magazine. 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. However, toe can also be used to alter a vehicle’s handling traits. A wheel offset that moves the wheel further outboard places greater stress on wheel bearings. If your motorhome tracked straight and the old tires were worn evenly and perfectly straight across, you can probably save your money. Front Suspension and Alignment. To achieve front rear adjustment of caster, an aftermarket adjustable top mount is usually required. 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 inside wheel must turn in a tighter radius than the outside wheel to allow a smoother turn and reduce tire scrubbing. 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. Factory camber specs are usually biased toward overall tire tread life for so-called normal driving. Find new motorhome tests and reviews, dinghy towing info, motorhome tips, RV camping gear and RV DIY projects at MotorHome magazine. 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. 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. Send them to [email protected]. 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. Freightliner Chassis Spec Sheets Each Freightliner chassis is custom built for each manufacturer and specific variations will exist between different brands of … You’re not the average driver! John Arch l Via email. 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. 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. Usually you want the left side to be a little more positive than the right to compensate for road crown. New Gear November 2, 2020. Privacy policy | Products. Have a technical question about your RV? I recently replaced all six tires with new Goodyear tires. Centerline steering refers simply to a “straight and level” steering wheel clock position when the vehicle rolls in a straight line. 228.0 228.0 GVWR (lbs.) It is a daunting job, and seems mysterious at best. Common upgrades to ride height as a result of installing lower, stiffer springs and possibly aftermarket steering arms with raised spindle locations. In some cases, the new wheels will have slightly less offset than the original and in other cases, slightly more. Camber thrust is generated by a leaning tire. 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. Reflecting decades of Tiffin innovation, the PowerGlide delivers everything an owner could wish for -- durability, reliability, performance, and control. 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. 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. If the wheel leans inward at the top, this is negative camber. Dialing in more negative camber serves to compensate, placing the load more evenly across the tire’s tread area. There's an art to engineering a motorhome, as elegantly demonstrated in the custom-built PowerGlide chassis. Call 1-800-727-7000. 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. Camber 1.0 degree Plus or Minus .75 degrees 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. When the lines cross above the road surface, this condition is known as negative scrub. 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. 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. You may have been in my predicament of seeing tire wear, pulling on the steering wheel, and loss of steering control. The performance- minded driver will benefit from a setting that’s negative. Front End Alignment on an RV. Sign up for your trial subscription and you’ll receive a FREE issue. A toe in of about 1/16 to 3/16 should be good. 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. So whaddaya do if you want a “performance” alignment? 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. Workhorse and Chevrolet Chassis Motorhome Forum: 2: 03-09-2010 01:42 PM: Wheel 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. 13) Perform alignment and recheck. 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. 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. Whenever possible, place the driver of the vehicle (or another technician of the same weight) in the driver’s seat during the entire alignment process. Front caster angle may or may not be readily adjustable, again, depending on suspension design. Incorrect wheel alignment conditions affect tire wear and can cause drifting and/or pulling during cruise, acceleration and braking, plus poor directional control. Always adjust tire pressure prior to performing any wheel alignment, and always follow the factory inflation specs for any street-driven vehicle. 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. tiffin-specs. 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. Incorrect wheel alignment conditions affect tire wear and can cause drifting and/or pulling during cruise, acceleration and braking, plus poor directional control. We offer a number of convenient ways for you to contact us and help to manage your account. Both SAI and IA are measured to verify that the fixed-by design angles are correct. As the miles pile up, coupled with age, suspension components gradually wear and/or deteriorate. Ideally, the front steer wheels need to be parallel while cruising to avoid tread scrub. 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. The more “sensitive” the tire, the more susceptible the vehicle is likely to become to road irregularities, since wider tires with shorter sidewalls and/or tires that feature stiffer sidewalls have a greater tendency to “track” the road surface. Choose the desired trim / style from the dropdown list to see the corresponding specs. 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. When the steer wheels are turned, individual wheel toe angle will change as compared to its straight-ahead static setting. An increase in toe-out can reduce an understeer tendency and will enhance initial turn-in during cornering. 0. Unfortunately, I’ve seen all too many realigned front ends cause worse tire wear because of shoddy workmanship. RV Tech Library - A part of the Tiffin RV Network. Also consider the condition of suspension components such as bushings, ball joints and shock absorber mounts. RV Tech Savvy: Can I Tow My Pickup with My Motorhome. If your specs are in inches, your toe-in or toe-out will be the difference between these two reading. Research 2012 Ford Super Duty F-53 Motorhome specs for the trims available. Period. Toe-in Car front tires are slightly pigeon-toed to intentionally place a very slight load on the wheel bearings. The SAI is determined at the point in which these two lines intersect. Front-end alignment for a motorhome isn’t much different from that for a passenger car. 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. 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. Most tire stores try to sell an alignment whenever new front tires are installed as a routine practice. This is a perfect example of why it’s important to inspect suspension and steering components prior to performing any wheel alignment. A supplementary verification is also strongly recommended at 20,000km (12000 miles). For daily street driving, following factory specifications is preferred to enhance both stability and directional control and to reduce tire wear. difference in the direction that the tire is pointed will result in the vehicle tramlining. For more information about Ford Credit and access to the Account Manager, go to Performing a precise wheel alignment assures maximum tire life, vehicle stability and control. Black Book. You have entered an incorrect email address! Manufactures brochures and info for Class A RVs from 2008 to present. Increasing positive caster improves highspeed stability but increases steering effort. This is intended to compensate for front tire and front suspension bushing deflection as the vehicle is driven forward. 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. ... also provides the specs for their independent suspension. The steering axle’s caster angle has a major influence in directional control. All Rights Reserved. Typical toe-in specs vary from one-thirty … The vehicles actual caster angles are within specifications. 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. If the front suspension is strut-equipped, camber may be adjustable (via an aftermarket kit) by adjusting the top of the strut mount inboard/outboard at the upper towers or, again, depending on design, by adjusting an eccentric at the lower mount at the strut-to-steering arm connection. 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 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. "Warning! 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. Live rear axles will feature no toe angle adjustment, since this is a fixed angle. This becomes more of a factor if the driver tends to be on the heavy side. In simple terms, SAI is the factory- designed “camber” angle of a specific wheel’s suspension system. It should drive like an SUV now. If it is a 16,000 to 22,000 lb chassis, here are the factory specifications. Install wheel liners if equipped. 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. Therefore, large changes in wheel offset will increase the likelihood of tramlining. 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. Front end alignment isn't something that most RV'ers will want to do and will opt to having a pro do the job. When the two lines cross exactly at the road surface, this is known as zero scrub. 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. 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. In the case of front-drive systems, this can also lead to overstress and wear on the outer CV joints. The terms and their meanings are discussed as follows. Imagine a worn suspension that allows a front wheel and tire to swing between the recommended 1⁄16 in. Should this coach have a front-end alignment because of the new tires and to help protect my investment? 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. 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. It should be obvious at this point that adjusting wheel alignment for the track will be detrimental for street driving, and vice versa. 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. If caster is to be adjusted, only one end would be adjusted. of toe-in and 1⁄16 in. Information should only be used as a guide - to select a manufacture just click on the manufacturers name below.. The alignment of the wheels, set by the chassis manufacturer before leaving the factory, should be checked at 1,500km (900 miles) without fail. Wheel offset has a direct bearing on tramlining as well. Otherwise, write “cancel” on the invoice, return it and owe nothing. 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 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. ... Find new motorhome tests and reviews, dinghy towing info, motorhome tips, RV camping gear and RV DIY projects at MotorHome magazine. If the front suspension features upper and lower control arms, the upper arm will likely be adjustable, either via the addition or removal of shims (between the upper arm and frame) or via eccentric bushings. 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. Scrub radius represents the point of greatest load on the tire tread area, primarily during turns. The following chart shows alignment specification values for various driving styles which can/should be provided to the alignment shop. Track settings are for the track, street settings are for the street. If alignment parameters (Caster and/or Camber) needs tweaking still adjust bushings accordingly. When the lines intersect below the road surface, the condition is called positive scrub. Toe is specified at 0.06 +/- 0.25 (per side I think). But, a toeout can also result in a darty, less decisive straight-ahead condition at speed, especially in wet or slippery conditions. Today’s production vehicles tend to offer a limited range of adjustment for camber and caster angles. 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 — Ken Freund. with this motorhome version of the P Chassis and wind up treating it like a truck. 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. 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. 14) Once satisfied with alignment. 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?). If the thrust angle aims left (driver’s side), this is a negative thrust angle. Camber spec is 0.5 +/- 0.5 degrees. Aftermarket upgrades—such as moving to wider tires, different wheel offset, shorter sidewall due to plus-sizing— are common. 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. Whether the rear toe is adjustable or not, always use a four-wheel alignment. Most gearheads understand the basic definitions of caster, camber, and toe, but when it comes to actually measuring or setting these wheel-alignment specs… In the case of a vehicle without power steering, this can cause an issue, depending on the vehicle weight and driver preference. 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). 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. The cost for … The three factors that affect alignment are toe-in, camber and caster. Installing wider tires or a plus-size tire and wheel package usually requires using wheels with a different offset than the vehicle’s original wheels. 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. As some of you know, my company supplies most of the wheel alignment equipment for Ford, as well as most other manufacturers. We own a 2000 American Eagle 40-foot diesel-pusher motorhome. Since these two lines will eventually intersect, it’s this intersection point that we’re really interested in. If a vehicle features rear wheel toe adjustment, we can achieve optimum wheel alignment using the total four-wheel alignment, which includes adjustment of all four wheels, allowing toe adjustment to bring the thrust angle to ideal zero, or as close to zero as possible. Another fixed angle is included angle (IA), which is the combination of SAI and wheel camber. If the steering wheel is not centered, this may indicate a possible thrust angle deviation. 24,000 26,000 If your specs are called out in degrees, take the measured difference between front and rear, multiply by 2, and that will be the approximate degrees. Even if all the tires are aimed straight ahead when the vehicle is in motion, a wheel that’s cambered naturally wants to turn. This would involve using the manufacturer’s maximum negative camber, maximum positive caster and preferred toe settings. The caster in this vehicle is read four degrees plus or minus one half degrees (.5°). As viewed from above, if the thrust angle aims to the right (passenger side), this is a positive thrust angle. 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. 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. Explore the greatest in RVs, travel, gear and more. The thrust line effectively divides left and right rear wheel toe. Upgrading to a set of higher performance tires can also result in a more pronounced tramlining issue. Little more positive than the outside motorhome alignment specs to allow the tire tread life in... To intentionally place a very slight load on the heavy side pressure prior to performing any alignment. On tramlining as well steer wheels need to be a little more positive than original... Set at a location on the motorhome is to be parallel while cruising to tread! Setting, and vehicle tracking remains relatively unchanged, slightly more its straight-ahead static setting to tramlining it! 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