Slipper Clutch. This refers to a device found primarily in off-road vehicles that allows the spur gear to slip under excessive load. This feature protects the driveline from excessive wear and, when set properly, makes it easier to drive in loose conditions.

Spur Gear. The large gear that meshes with a pinion gear or clutch bell to provide power to a vehicle¡¦s drivetrain.

Stagger. The difference between the circumferences on the left and right side tires, In oval racking, a positive stagger means the outside tires are larger than the inside.

Tire Truer. On-road racers running foam tires are likely to have a truer in their pit boxes. When the foam donuts become worn or damaged, the surface can be renewed with a tire truer, a machine that operates in the same manner as a lathe.
Toe Angle. When seen from above, a car¡¦s front wheels will point inward when the steering trim is set to neutral. Applies to the near wheels as well. This provides some degree of stability. Too much toe angle will slow you down.

TQ. Top Qualifier. The driver who turns the most laps in the shortest amount of time. In full scale racing this is known as the pole setter.

Transmitter. The part of a radio system that is used by the driver to control a vehicle. The transmitter sends signals based on a drivers input to a receiver that is mounted in a vehicle.

Transponder. This is a small electronic device mounted in a race vehicle. It transmits a signal to a receiver located at the start / finish line. The receiver records a vehicle¡¦s position and lap times during a race for scoring purposes.