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Tire Terminology:

A B C D E F G H I K L M N O P R S T U V W Z

   
Rack-and-Pinion System
The steering now most used for front wheel drive cars in which a gear at the end of the steering column meshes with a rack of steel teeth; the rack is then connected to the steering arms.
Radial Play
The side-to-side movement of a ball joint.
Radial Tire
A tire built with casing plies that cross the crown at an angle of 90 degrees.
Rayon
A synthetic cord material used in casing and belt construction; provides high dynamic strength and good rubber adhesion.
RCOT
Bridgestone's Patented Rolling Contour Optimization Theory of tires designed to optimal operation tire shape.
Rear Spacing
See Backspacing.
Re-circulating Ball System
The conventional type of steering system in which steering motion is transferred through a gearbox.
Repacking
The repacking of wheel bearings with quality, heavy-duty grease according to manufacturer's specifications.
Retread
A used casing which has new tread rubber applied to it.
Returnability
The ability of a vehicle to return to a straight ahead attitude after removal of steering input.
Revolutions Per Mile
The number of revolutions a tire makes in a mile at a given load, inflation, and speed.
Ribs
The rubber elements at the tire tread which contact the ground, oriented in a generally circumferential direction.
Ride Height
The distance between the frame of the vehicle and the road.
Rim Diameter
The diameter of the bead seat, not the diameter of the rim edge.
Rim Drop
The area of the wheel's rim having the smallest diameter.
Rim Flange
The outermost edge of a wheel's rim to which clip-on weights are attached.
Rim Width
The measurement inside of the rim flanges; i.e. from inside the flange on one side to inside the flange on the other side.
RMA
Rubber Manufacturers Association.
Road Wheel
A large diameter (typically 67") steer wheel capable of rotating at selected speeds; used to simulate road surface for tire testing.
Rolling Resistance
The force required to roll a loaded tire.
Rotation
The pattern of movement of tires to different positions on a vehicle to compensate for irregular or unequal tire wear.
Rubber-To-Void-Ratio
The ratio between the rubber area and the groove area in a tire footprint.
Rubbing
A condition where a tire rubs against the wheel well or the exhaust system.
Runout Gauge
A device used to check and correct radial and lateral run out.
 

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