Rear clipThe section of a race car that begins at the base of the rear windshield and extends to the rear bumper.
Rear-steerA car in which the steering components are located behind the front axle.
RestartThe waving of the green flag after a caution period.
Restrictor PlateAn aluminum plate designed to reduce the flow of air and fuel into the engine's combustion chamber.
Ride heightThe distance between the car's frame rails and the ground.
Roll cageThe steel tubing inside the race car's interior. Designed to protect the driver from impacts or rollovers, the roll cage must meet strict NASCAR safety…
Roof flapsA key safety feature in NASCAR race cars, the flaps are placed on the roof of the car and pop up when a car is running backwards to keep the car on the…
RoundSlang term for a way of making chassis adjustments utilizing the race car's springs.
RPMShort for revolutions per minute, the measurement of the engine's crankshaft.