| Glossary T | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0..9 | A | B | C | D | E | F | G | H | I | J | K | L | M |
| Misc | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
T.D.C. Top dead centre. The point at which the crankshaft and piston are in their highest possible position.
Telescopic Forks Front suspension system with two fork legs, each with sliding and fixed tubular members that telescope together to allow suspension movement.
Timing Measurement of the moment at which valves open or close, or when the spark occurs. It is normally expressed in degrees or millimetres before t.d.c. (see ignition timing and port timing).
Total Loss Ignition or lubrication system in which electricity or oil is used without being generated or recirculated. The ignition system uses power from a battery, eventually running it flat. The lubrication system uses oil without returning it to a tank. Both systems were common on early motorcycles. Two-stroke engines use a total-loss lubrication system.
Trail Bike Dual purpose machine for use on or off-road.
Trailing Link Front suspension design similar to leading link except the layout is reversed: the links pivot forward of the axle.
Trials Off-road competition in which the rider has to surmount obstacles. Points are deducted if the rider puts his feet on the ground, goes outside the marked course, or fails to clear an obstacle.
TT Tourist Trophy races held on the Isle of Man.
Twin-Spar Frame Frame in which the steering head and the swingarm pivot are connected by two metal, usually alloy members that wrap around the engine.
Twin-Port A cylinder head design in which there are two exhaust ports.