Wheelbase Torque Calculator: Nm, Gain and Mounting
Most sim racers run 4 to 8 Nm of working torque at the rim regardless of what their base is rated at, and the gain percentage that produces it is simply working torque divided by peak torque. A 21 Nm base at 30 percent gain and a 9 Nm base at 70 percent gain both deliver about 6.3 Nm to your hands. Your frame sets the ceiling: a desk clamp reacts about 5 Nm, a wheel stand about 8 Nm, a steel cockpit about 12 Nm and aluminium profile about 25 Nm.
The number on the box is not the number at your hands. A wheelbase rated at 21 Nm run at 30 percent gain delivers about 6.3 Nm, which is exactly what a 9 Nm base delivers at 70 percent. The rating is headroom, not everyday output, and the practical limit on how much of it you can use is almost never the base. It is what the base is bolted to. This calculator turns a peak torque figure and a frame type into the working torque you should actually run, the gain percentage that produces it, and a plain verdict on whether the mounting can hold it.
Wheelbase torque calculator
Pick your base or enter a peak torque figure, choose the frame it is mounted to and how strong you want the wheel to feel, and the tool returns the working torque, the gain percentage, the headroom you are keeping in reserve, and whether the frame can react it.
How the gain number is calculated
The arithmetic is one division, which is why it is worth doing rather than guessing.
Gain percentage equals working torque divided by peak torque, times one hundred. A 6 Nm target on a 9 Nm base is 6 divided by 9, which is 66.7 percent. The same 6 Nm target on a 21 Nm base is 28.6 percent. Both wheels feel identical in ordinary cornering. The difference appears only at the peaks, where the 9 Nm base has 3 Nm of reserve and the 21 Nm base has 15 Nm of it.
The frame limit is applied first. If your target working torque is higher than the frame can react, the calculator clamps to the frame limit and says so, because torque you cannot mount is torque you cannot use. That single rule prevents the most common expensive mistake in this hobby, which is buying a high torque base for a frame that cannot hold it.
What torque can each frame actually react?
These are working limits rather than destruction limits. A frame at its limit does not break, it moves, and movement is what ruins feedback: the base twists relative to your body, so the force you feel is the force minus whatever the frame absorbed, and that subtraction changes with every input. Manufacturer mounting instructions and torque figures govern, and where they are stricter than the table, use theirs.
| Mounting | Comfortable working limit | Absolute practical limit | What fails first | Typical bases that suit it |
|---|---|---|---|---|
| Desk clamp | 3 Nm | 5 Nm | Clamp creeps, then releases | MOZA R3, gear and belt wheels |
| Wheel stand, folding | 5 Nm | 8 Nm | Frame rocks fore and aft | MOZA R5, Thrustmaster T598 |
| Folding cockpit | 6 Nm | 8 Nm | Hinges take up slack, wheel deck twists | MOZA R5, Fanatec CSL DD at 5 Nm |
| Fixed steel cockpit | 9 Nm | 12 Nm | Wheel deck flexes under peak load | MOZA R9 V3, Thrustmaster T818 |
| Heavy steel cockpit | 12 Nm | 16 Nm | Frame walks on carpet without a mat | MOZA R12 V2, Fanatec ClubSport DD |
| 8020 or 8040 aluminium profile | 21 Nm | 25 Nm and above | Nothing, if the fasteners are torqued | MOZA R21, Simucube 2 Pro and Ultimate |
The pattern in that table is the whole argument for buying the frame before the base. Moving from a folding cockpit at $253.26 to a fixed steel cockpit at $499.99 roughly doubles the torque you can usefully run, and it does so without touching the wheelbase at all. The same logic runs through the first sim rig buying order, and it is why the expert build spends more on the frame than on the pedals.
Why headroom matters more than peak strength
Force feedback signals stack. At any instant the physics engine is asking for a steady cornering load, plus a road surface texture, plus whatever the suspension is doing, plus any transient event like a kerb strike or a lock-up. Those add together. If the sum exceeds what the base can produce, everything above the ceiling is output at the ceiling, which is clipping.
What clipping costs you is precisely the information you were listening for. The steady cornering load survives, because it is well below the limit. The transient on top of it, the one that tells you the front tyres just started to slide, is the part that gets flattened. The wheel goes numb at exactly the moment the car is doing something interesting, which is why drivers frequently describe a clipping setup as "vague" rather than as "too strong".
Running a large base at low gain avoids that entirely. A 21 Nm base at 30 percent has 15 Nm of space above your normal cornering load, so the transients arrive intact. That is the honest argument for a high torque base, and it is a very different argument from wanting a heavy wheel. The procedure for finding clipping in your own setup, using the telemetry overlay in your sim, is in sim racing force feedback settings, and the per-title starting numbers are in force feedback settings by game.
How strong should the wheel actually feel?
A real GT car at racing speed puts roughly 5 to 8 Nm through the steering wheel, and a modern power assisted road car puts through considerably less. That is the honest reference point, and it is well below what many sim racers set. There is nothing wrong with running a heavier wheel than reality if you like it, but three things get worse as you go up.
- Fatigue over a stint. Ten minutes at 10 Nm is fine. Ninety minutes at 10 Nm changes how you drive in the last third of a race, and it changes it in a way you will blame on the car.
- Precision. Fine steering corrections are harder to make against a heavy wheel, and catching a slide requires speed of input more than strength.
- Injury risk. A high torque base can sprain a wrist or a thumb, especially in a snap oversteer moment where the wheel goes to full lock faster than you can let go.
The most common good setting across the hobby is somewhere between 4 and 7 Nm of working torque, with the rest of the range kept in reserve. Start at 5 Nm, drive a full stint, and change it once rather than fiddling every lap.
Which base should you buy for your frame?
Work backwards from the mounting, because it is the harder constraint to change. If you are on a desk, the honest ceiling is a MOZA R3 at 3.9 Nm at $139.00 or a belt wheel, and no amount of wanting more changes that. If you have a folding frame, the MOZA R5 bundle at 5.5 Nm at $379.99 is the sensible ceiling. On a bolted steel cockpit, the MOZA R9 V3 at 9 Nm at $299.99 is the point where the base stops being the limiting factor for most drivers. Only on aluminium profile does a MOZA R21 at 21 Nm at $947.16 make sense, and even there it is bought for headroom rather than for output.
Console drivers have a shorter list, because licensing is enforced in hardware. The Logitech G PRO Racing Wheel at 11 Nm at $999.99 and the Fanatec CSL DD and ClubSport DD family are the realistic options, and the Fanatec ecosystem is the only mainstream one that covers both Xbox and PlayStation. Every MOZA base in the list above is PC only.
One more time, because it is the most valuable sentence on this page: if your budget is fixed and the choice is between more torque and a load cell brake, buy the load cell brake at $159.99. Braking is where most amateur lap time is lost, and pressure based braking transfers directly from how a real brake works. Full reasoning is in the pedals roundup.
For the published peak torque of every model rather than the ones in the selector, see the wheelbase torque chart and the per-model pages in the wheel and wheelbase database. To price a whole rig rather than one component, use the build cost calculator, and to check the frame will physically fit the room, the rig space calculator.
Frequently asked questions
How many Nm do I need for sim racing?
Most drivers settle between 4 and 8 Nm of working torque at the rim, whatever their base is rated at. A 5 Nm base run near full output and a 12 Nm base run at 50 percent both deliver 5 to 6 Nm to your hands. The rating buys headroom so transients do not clip, not everyday strength. If you are choosing a number to buy, 8 to 9 Nm covers almost everyone provided you can bolt it to a rigid frame.
What is force feedback clipping?
Clipping happens when the forces the physics engine asks for exceed what the base can output, so every peak above the ceiling is flattened to the same value. You lose exactly the transient detail you were listening for: the kerb strike, the moment of lock, the front tyres letting go. It sounds like the wheel going numb at the busiest moment. The fix is lowering overall gain, not raising it.
Can I use a 12 Nm wheelbase on a desk?
No, and not because of a rule but because of arithmetic. A desk clamp reacts torque through a small contact patch and the friction of a rubber pad. Above roughly 5 Nm the clamp starts to creep, and above 8 Nm it will move noticeably or fail. A 12 Nm base bolted to a desk edge is capable of pulling the clamp off, which is both a hardware risk and an injury risk.
Does a stronger wheelbase make you faster?
Not directly. What a stronger base changes is how much detail survives at the top of the force range, which helps you feel the limit earlier. Braking is where most amateur lap time is lost, so a load cell pedal set at $159.99 will usually improve lap time consistency more than the same money spent moving from 5 Nm to 9 Nm. Fix the brake first, then buy torque headroom.
Why is my recommended gain so low on a big base?
Because gain is a percentage of the ceiling, and the ceiling moved. A 21 Nm base set to 30 percent produces about 6.3 Nm at the rim, which is the same working force as a 9 Nm base at 70 percent. The high torque base is not weaker, it simply has more of its range in reserve, which is the entire reason to own one. Chasing a high gain number on a big base is how people injure a wrist.
Should I set torque in the driver or in the game?
Set the hardware ceiling in the driver, then adjust per car in the game. The driver limit is the safety and headroom setting and should be chosen once, based on your frame and your arms. In-game force feedback multipliers are per car and per title, and they are where you correct a car that clips or a car that feels dead. Changing the driver limit per car makes every previous setup number meaningless.
How we choose: we compare published manufacturer specifications, documented torque and travel figures, and verified owner reviews. We do not test gear in person. Everything here is researched guidance, not professional installation advice. Direct drive wheelbases produce enough torque to injure a wrist, and rig hardware carries real weight, so follow the manufacturer's mounting and torque limits.