![]() SmartWay is a unique collaboration between freight shippers, fleets and logistics companies to voluntarily achieve improved fuel efficiency and reduced emissions from freight transport (Tires, specifically so-called fuel-efficient tires, play a major role in the EPA-administered program. The CVSA manual can be downloaded and purchased at SmartWay If a motor vehicle is carrying passengers, then retreaded or regrooved tires are not allowed on the steer axle. This has always been an issue with fleets since it is almost impossible to tell if a radial truck tire has low tire pressure just by looking at the tire. The CVSA guidelines also state that the inspector is to measure the actual tire inflation pressure only if there is evidence the tire is underinflated. It would also be put out-of-service if the actual inflation pressure was 50% or less of what is marked on the tire sidewall. If a tire has an air leak that can be easily heard or felt, the vehicle would be put out-of-service. When it comes to bulges potentially related to a tread or sidewall separation, they allow a bulge up to 3/8-inch inch in height. Their rules are based on CFR 393.75, but with a few additional specifics to make it easier for inspectors during an on-highway vehicle inspection.ĬVSA uses the same 4/32-inch and 2/32-inch tread depth guideline as stated in CFR 393.75. On April 1 every year, CVSA issues their updated out-of service criteria. If the tire is hot when it is checked, then an additional 15 psi greater than the cold pressure listed on the sidewall is allowed. ![]() The last section, Part H, states that no motor vehicle can be operated at a cold tire inflation pressure less than specified for the specific load. Tire load-inflation tables, which take into account tire being run at low speeds, are published annually by the Tire & Rim Association ( Part G allows for an 18% tire overload when hauling manufactured homes. The only exceptions are if you have a special permit issued by the state or you are operating the vehicle at a reduced speed. ![]() Motor vehicles are not allowed to be operated with tires that carry a weight greater than that marked on the tire sidewall. Part F is for all motor vehicles except for those trucks that are hauling manufactured homes, which are detailed in Part G. Parts F and G are the rules governing tire load restrictions. If the tire load capacity is equal to or greater than 4,920 pounds, then a regrooved tire can’t be used on the steer axle of a truck or tractor. Regrooved tires, which are not very popular and are used primarily in city bus tires, are addressed in Part E. This is the only regulation that limits on what axle position retreaded tires can be run. Part D only applies for busses and does not allow retreads or regrooved tires to be run on the steer or front tires. The minimum tread depth for steer tires is 4/32-inch, and 2/32-inch for any other wheel position. The measurement must be done in a major groove but should not be made where there are stone ejectors, tie bars and/or humps. Parts B and C describe the minimum tread depth allowed.
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