Operation CHARM: Car repair manuals for everyone.

Wheel and Tire

WHEEL AND TIRE
Wheel information





Original equipment wheels are designed for proper operation at all loads up to the specified maximum vehicle capacity.
All models use steel or aluminum drop center wheels. Every wheel has raised sections between the rim flanges and rim drop well called safety humps.
Initial inflation of the tires forces the bead over these raised sections. In case of air loss the raised sections hold the tire in position on the wheel until the vehicle can be brought to a safe stop.
The wheel studs and nuts are designed for the specific wheel applications used on a vehicle and must be replaced with equivalent parts.
Before installing a wheel, remove any build up of corrosion on the wheel mounting surface.

Caution: Installing wheels without good metal to metal contact could cause loosening of wheel lug nuts. This could adversely affect the safety and handling of your vehicle.

Tire identification





Tire type, size, aspect ratio and speed rating are encoded in the letters and numbers imprinted on the sidewall of the tire. Refer to the chart to decipher the tire identification code as below.
Performance tires will have a speed rating letter after the aspect ratio number. The speed rating is not always printed on the tire sidewall. The letter S indicates that the tire is speed rated less than 112 mph (180 km/h)
- T less than 118 mph (190 km/h)
- H less than 130 mph (210 km/h)
- V less than 149 mph (240 km/h)
(consult the tire manufacturer for the specific speed rating)