Wheelbases: belt vs direct drive explained

Wheelbases come in three drive types: gear-driven, belt-driven, and direct drive. They differ in one thing — how motor torque reaches the wheel rim — and that single difference decides how smooth, detailed, quiet, and strong the force feedback is.

The three wheelbase types

Gear-driven: a small fast-spinning motor turns reduction gears that multiply torque. Cheapest. Logitech G29, G920, and G923.
Belt-driven: a toothed belt and pulleys carry torque from the motor. Smoother than gears. Thrustmaster T300, T-GT, TS-PC.
Direct drive (DD): the wheel bolts straight onto the motor shaft. No gears, no belt. Moza, Fanatec CSL DD, Simagic, Simucube, and the Logitech G PRO.

Gear-driven: cheap, notchy, loud

A gear-driven base feels notchy because of backlash — the slack between gear teeth. Every time the force changes direction, the teeth have to take up that gap before they bite, and you feel it as a faint click or step. It is most obvious on straights, where the forces are tiny and the gear lash is a large fraction of what you feel. Gears are also loud, and they wear. A Logitech G29 delivers roughly 2 Nm at the rim, and that is the practical ceiling — a bigger motor just chews the gears faster.

Belt-driven: smoother but muffled

A belt-driven base swaps the gears for a toothed belt and pulleys. The belt damps vibration, so it is smoother and quieter than gears and loses the notchy clicking. The cost is detail: the belt has compliance — it stretches slightly under load — which filters out fine information like kerb texture and tire scrub and adds a touch of lag and dead feel on-center. Torque is capped by what the belt can transmit before it slips or wears, so belt bases top out around the same place gear bases do.

Direct drive: the motor is the wheel

In a direct-drive base the wheel mounts directly to the motor shaft, so the force you feel is the torque the motor makes, 1:1. No gears, no belt, no backlash. That means lower latency, near-silent operation, and no consumable parts to wear out. Fine detail survives all the way to the rim because nothing mechanical sits in between to filter it — you feel the front tires load under braking, the kerb rumble, the moment the rear steps out.

Why direct drive won

Belt and gear bases cannot scale torque. Drop a bigger motor into one and you just chew up the belt or the gears — the mechanism is the ceiling. Direct drive scales by fitting a bigger motor and a smarter controller, with no extra parts in the path. On top of that, the price gap that used to justify belt drives has collapsed: entry DD now starts around the price of a good belt base.

What about cogging?

Cogging, or torque ripple, was DD’s historical weakness — faint magnetic “steps” you feel at low speed as the rotor passes the stator poles. Better motors, high-resolution encoders, and firmware filtering have largely killed it on current bases. Old or very cheap DD units can still show a trace of it, but on a modern base it is a non-issue.

How much torque (Nm) do you actually need?

5 to 8 Nm is plenty for most drivers. GT and formula cars in iRacing feel right in that range, and 8 Nm is the common sweet spot. For reference, real race cars with power steering sit around 3 to 7 Nm at the rim, so high torque numbers are headroom, not realism. For the full breakdown of how much torque you actually need, see the dedicated torque guide.

Peak torque by tier:

Entry: Fanatec GT DD Pro 5 Nm (8 Nm with the boost kit), Moza R5 ~5.5 Nm, Fanatec CSL DD 8 Nm, Logitech G PRO 11 Nm.
Mid: Moza R9 9 Nm, Moza R12 12 Nm, Simagic Alpha class 12-18 Nm, Fanatec ClubSport DD 15 Nm and DD+ 18 Nm (after the May 2026 firmware bump from 12 and 15 Nm respectively — a free update, v1.4.2.3+).
High: Moza R21 21 Nm and R25 Ultra 25 Nm, Fanatec Podium DD 25 Nm constant (33 Nm peak), Simucube 3 Pro 25 Nm and Ultimate 35 Nm.

One mount warning: 12 Nm and up will rip a desk clamp loose and flex a cheap rig. High-torque DD wants a bolted aluminium-profile rig, so budget for the mount before you buy more Nm than your desk can hold.

Which type should you buy?

Buy direct drive. An 8 Nm entry base like the CSL DD, Moza R5, or Logitech G PRO costs near what a belt base does and beats it on smoothness, detail, latency, and noise. For which direct drive to buy at your budget, see the budget buying guide. Choose belt only if a specific bundle deal or ecosystem (existing rims, pedals) makes it cheaper for you right now — and check pedals and your rig before you push past 12 Nm.

Frequently asked questions

What's the real difference between a cheap wheel and an expensive direct-drive one?

How the motor torque reaches the rim. Gear and belt drives add lash and compliance that filter out kerb texture and on-center detail and cap torque around 2 to 4 Nm. Direct drive bolts the rim straight to the motor shaft for 1:1 force, lower latency, near-silent operation, and 5 to 35 Nm of clean, detailed feedback with no consumable parts.

Does a direct-drive wheel make you faster or make racing easier?

No, it does not lower lap times by itself — it adds detail and feel, not grip. DD removes gear lash and belt smear so you feel the front tires start to wash and the rear step out earlier, which makes the limit easier to read. The improvement comes from reading those cues, not from the motor.

Is a cheap wheel like the Logitech G29 still better than a controller?

Yes for most racing — a wheel gives analog steering precision and, on the G29, roughly 2 Nm of force feedback through plastic gears that a controller cannot match. But the gear-driven G29, G920, and G923 top out near 2 Nm with backlash, so an entry direct drive is the bigger jump once budget allows.

Is cogging still a problem on modern direct-drive bases?

Mostly no. Cogging, or torque ripple, was DD's old weakness — faint magnetic steps felt at low speed — but better motors, high-resolution encoders, and firmware filtering have made it a non-issue on current bases. Only old or very cheap DD units still show a trace of it.