A direct drive wheelbase does not just turn the wheel. On every curb and every slide it pushes back on whatever it is bolted to. If the cockpit bends, you lose the detail you paid for, and the wheel feels vague exactly when it should talk. Choosing a cockpit for a direct drive base comes down to four checks.
1. Match the profile to your torque
Aluminum cockpits are built from extruded profile. The bigger the section on the members that carry the wheel deck, the more torque the frame can hold without flexing. Rig makers publish close to the same guide:
| Profile | Wheelbase torque | Typical bases | Laprig |
|---|---|---|---|
| 40 × 40 | up to about 10 Nm | Logitech G29 / G923, Thrustmaster T248 / T300, MOZA R3 / R5 | Fold-80 (folding 4080, rated to 10 Nm) |
| 40 × 80 | 14 to 20 Nm | MOZA R9 / R12 / R16, Fanatec CSL DD, GT DD Pro, Simagic Alpha Mini | GT-80 |
| 40 × 120 | up to 25 Nm | Fanatec ClubSport DD, Simagic Alpha EVO, Simucube 2 Sport | GT-120 |
| 40 × 160 | 30 Nm and up | MOZA R21 / R25 Ultra, Fanatec Podium DD, Simucube 3 Ultimate (35 Nm) | F-160 |
Buy for the base you will own, not the one you have. If a 21 or 25 Nm base is on your list for next year, a 40 × 80 chassis will be the part you replace.
2. Check how your base mounts
Three standards cover almost every base on the market:
- Bottom mount, 4 × M6 on a 78.4 × 66 mm pattern: MOZA R9 to R25.
- Bottom mount on sliding T-nut rails: Fanatec CSL DD, GT DD Pro, ClubSport DD and Podium (side mount also possible), Asetek.
- Front mount, 4 × M8 on a circle: Simagic Alpha (Ø130 mm), Simucube 3 (Ø135 mm), Simucube 2 (Ø145 mm).
A slotted wheel deck takes the first two without drilling. Front-mount bases need a front plate drilled for their circle. Use the fit checker on each cockpit page to see your base.
3. Check the seat and the pedals
Most bucket seats use side brackets spaced at 290 mm, some at 320 mm. Make sure the cockpit offers both. For pedals, a slotted plate that accepts M6 and M8 bolts and adjusts in angle and reach takes load-cell and hydraulic sets without an adapter.
4. Plan the screens
A monitor mounted on the cockpit is simple and cheap, but it moves with the frame. With triple screens or a motion platform, a free-standing stand keeps the image still. Then set your field of view with our FOV calculator.
The short version
Up to 10 Nm, any decent folding cockpit works. From 14 to 20 Nm, take a 40 × 80 chassis like the GT-80. Above 20 Nm, go to 40 × 120 or 40 × 160. And whatever you choose, check the mount before the price.
Sources: torque guides published by SimXPro and Trak Racer; mounting patterns from Simline, Fanatec and Logitech documentation.