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