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Tire Selection Terms
Curb Weight Driver and Occupant Weight Accessory Weight Extra Equipment Weight Cargo Load

 

  1. TIRE SELECTION
    Light Truck and Truck/Bus Tires — Selection of size and load range on each axle shall be based upon the highest individual wheel load.
    Maximum load per tire shall not be greater than the applicable load specified herein for the proper load range and usage.


  2. Passenger Tires — Regulatory requirement when replacing a vehicle’s OE LT tires with passenger car tires: The load on each replacement passenger car tire must not exceed the maximum load stamped on the tire sidewall divided by 1.10.


DEFINITIONS OF TERMS
Maximum Load — The maximum load on individual tires is to be determined by the manufacturer of the completed vehicle, and shall include:


a) Curb Weight — Manufacturer’s weight of the completed vehicle with standard equipment including cab and/or utility body and the maximum capacity
of engine fuel, oil and coolant.


b) Driver and Occupant Weight — 150 pounds per occupant for the vehicle’s designated seating capacity. For city and city-suburban busses, occupant
load is based on 150 pounds per occupant and 150% of full-seated rating. For intercity busses, occupant load is based on 185 pounds per occupant
(to include luggage) and 100% full-seated rating.


c) Accessory Weight — Combined weight of those installed regular production options (not previously considered in curb weight) weighing five pounds or
more. If such options replace standard items, include only the excess if the excess is over five pounds.


d) Extra Equipment Weight — Weight of any non-standard item other than accessories which are affixed to the vehicle.


e) Cargo Load— Consists of weight in the cargo area. Consideration shall be given to all possible ways the user can load the vehicle approved by the
manufacturer, including uneven loading side to side. The user who loads such vehicles unevenly must be responsible for reducing the maximum
cargo load to prevent overloading any tires. For intercity busses, the maximum cargo load must also be included in addition to the occupant load in determining maximum tire load.


Cold Inflation Pressures — The inflation pressures shown in this section are those taken with the tires at the prevailing atmospheric temperatures and do not include any inflation pressure build-up due to vehicle operation.

  1. NOTES ON TIRE SELECTION
    The selection of tire sizes shall be based on meeting the requirements of maximum load as defined above. Maximum load as defined above must not
    exceed the maximum tire load limit indicated by the bold face type in the table. Minimum recommended cold inflation pressures for various loads
    must conform to the load table.

  2. Improved Surface — An improved surface is one, which is relatively smooth and intended to handle any vehicle manufactured primarily for use on
    the public streets, roads and highways.


INFLATION LIMITATIONS LIGHT TRUCK TIRES
The inflations shown in the load tables are minimum cold pressures for the various loads listed. Higher pressures should be used as follows:
A. When required by the speed/load table, table 1 on Page L-2.
B. When higher pressures are desirable to obtain improved operating performance. The combined increases of A and B should not exceed 10 PSI above the inflation specified for the maximum load of the tire.
THE MAXIMUM LOAD AND INFLATION CAPACITY OF THE RIM MUST NOT BE EXCEEDED.


TRUCK TIRES
The inflation shown in the load tables are minimum cold pressures for the various loads listed. Higher pressures should be used as follows:
A. When required by the speed/load table, table 2 or 3 on Pages L-2 and L-3.
B. When higher pressures are desirable to obtain improved operating performance.
The combined increases of A and B should not exceed 20 PSI above the inflation specified for the maximum load of the tire.
THE MAXIMUM LOAD AND INFLATION CAPACITY OF THE RIM MUST NOT BE EXCEEDED.

 

 

 

RL4B Tire

 

RL4J Tire

 

RT3A Tire

 

GP2B Tire

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