A direct drive wheel — sometimes called a DD wheel, a DD wheelbase, or just a direct drive — is a sim racing steering wheel that bolts straight onto an industrial servo motor with nothing in between. No belts. No gears. No reduction stage. The motor itself is the steering column, and the force feedback signal the simulator generates goes straight from the game engine to your hands without anything mechanical in the middle to soften, delay or smear it.
Older sim racing wheels used belts (Thrustmaster T300, Logitech G Pro before the RS50) or gears (Logitech G29) to step a small fast motor down into something that felt strong enough at the wheel rim. Both approaches work. Both also lose detail. Belts swallow the highest-frequency texture. Gears introduce a small dead zone every time the load reverses. Direct drive removes both problems by removing the intermediate hardware entirely.
The result is a force feedback signal that is faster, more detailed, and stronger. Tyre slip arrives as a continuous gradient. Kerbs are crisp rib by rib. The moment a front wheel lifts on a turn-in is a thing you feel rather than a thing you guess at. Once you have driven on direct drive for a week you do not go back.