Formula vs Round Steering Wheel: How to Choose Your Sim Rim

Quick answer

Match the rim to the cars you drive most. Choose a formula rim if you mainly race open-wheelers, prototypes or GT cars and want a compact, button-dense wheel that keeps your hands at nine and three. Choose a round rim if you drive road cars, rally, drifting or trucks, or if you regularly turn past 180 degrees and need to shuffle or cross your hands. If you split your time, buy the rim for your primary discipline first and add the other shape later.

The shape of your rim changes how you steer, how quickly you find a button and how much of the screen stays visible. It is one of the few sim racing purchases that affects every lap you drive, which is why the formula vs round steering wheel decision deserves more than a glance at photos.

This guide gives you decision rules rather than a ranking. Work through the car types you actually race, the steering angles they require and the space your rig has, then pick the shape that fits. Both shapes can be fast; the wrong one for your discipline just makes you work harder.

Start with the cars you drive, not the wheel you like

Open-wheel, prototype and most GT cars use a small, flat-bottom or fully rectangular rim with a fixed hand position. A formula rim matches that geometry: your hands stay near nine and three, your thumbs rest on the grips and the buttons sit under your fingers. Because you rarely turn more than about 180 degrees in these cars, the shape never gets in the way.

Road cars, rally, drifting and truck sims need far more lock. A round rim lets your hands slide around the outside of the wheel and pass from one side to the other without your wrists catching a corner. If your favourite car needs more than one full turn of lock in a hairpin, a round rim is the practical choice.

Write down the three cars you drove most this month. If two or more are open-wheel or GT, a formula rim is the better first purchase. If two or more are road, rally or drift, go round.

• Open-wheel, prototype, GT: formula rim
• Road, rally, drift, truck: round rim
• Mixed list: buy for the discipline you race most, not the one you talk about most

How much lock do you actually use?

Steering lock is the clearest dividing line. In most formula and GT cars you stay inside roughly 180 degrees of rotation, so a rectangular rim never forces an awkward hand position. Rally and drift cars regularly ask for 360 degrees or more, and a round rim is the only shape that lets you shuffle or cross your hands smoothly.

If you set a high steering range in your wheel software for road cars, remember that the rim has to cope with it. A formula rim at 540 degrees or more quickly becomes uncomfortable on tight corners because the corners of the rim pass through your hands.

Check your wheel base settings before you buy. If you run different rotation ranges per car class, you are effectively asking one rim to do two jobs, and that is the situation where owning both shapes makes sense.

• Under about 180 degrees of lock: formula rim is comfortable
• Over about 360 degrees of lock: round rim is the safer choice
• If you change rotation range per car, plan for two rims eventually

Rim diameter, grips and button layout

Formula rims are usually smaller in diameter, which makes them feel quick and keeps your arms close to your body. That is an advantage in a tight cockpit, but a small rim also amplifies force feedback, so a strong direct drive wheel base can feel more aggressive through your hands. Round rims are generally larger and give you more leverage, which smooths out the same force.

Button layout matters more than most buyers expect. Formula rims group many buttons, rotary dials and paddles close to your thumbs, so you can change brake bias or traction control without moving your hands. Round rims often carry fewer inputs, which is fine for road cars but limiting if you race GT3 with a lot of in-car adjustments.

Grip shape is the last check. Formula grips are moulded for a fixed hand position; round rims usually have a thinner, more neutral rim. If you have large hands or prefer a thicker grip, try to handle the rim before committing, or buy from a seller with a clear return policy.

• Small formula rim: quicker feel, more force feedback through your hands
• Larger round rim: more leverage, smoother feel
• Count the buttons and dials you actually use before choosing

Rig clearance and mounting

A formula rim sits closer to your chest in most cockpits because of its shape, so check that your seating position still leaves room for your wrists to move. A round rim sweeps a larger circle, which can foul a keyboard tray, a button box or a monitor stand that sits low over the wheel deck.

Measure the space around your wheel before you buy. Sit in the rig, hold an imaginary rim and turn it through its full range. If anything touches your forearms at full lock, a smaller diameter or a different shape will solve it more cheaply than rebuilding the rig.

If you run a triple-screen setup, remember that a larger round rim can block more of the lower screen area. Formula rims are usually shallower and keep more of the dash visible, which matters in cars where you read a display on the wheel itself.

• Sweep the full steering range in your rig before buying
• Check clearance to keyboard trays, button boxes and monitor mounts
• Triple screens: a smaller rim blocks less of the lower display

What about quick releases and sharing one base?

Most direct drive wheel bases accept multiple rims through a quick release, so the real question is not which shape to own forever but which to buy first. A quick release lets you swap between a formula rim for GT3 and a round rim for rally in under a minute, provided both rims use a compatible mounting system.

If you plan to own both, buy the rim for your main discipline first and add the second shape when you notice yourself avoiding certain cars because the rim feels wrong. That is a clearer signal than a spec sheet.

When you buy the second rim, keep the same brand and mounting standard where you can. Mixing systems often means extra adapters, and adapters can add flex or change the distance between you and the wheel.

• One base, two rims is a normal setup with a quick release
• Buy for your main discipline first
• Stay within one mounting standard to avoid adapters

Decision rules for choosing a rim shape

• Rule 1: Race open-wheel or GT most of the time: Choose a formula rim. Your hands stay at nine and three, the buttons sit under your thumbs and you rarely need more than about 180 degrees of lock. Buy the formula rim first if this is your main discipline.
• Rule 2: Race rally, drift or road cars regularly: Choose a round rim. You need to shuffle or cross your hands, and a rectangular rim gets in the way once you pass roughly 360 degrees of rotation. A round rim is the safer first purchase for high-lock driving.
• Rule 3: You split your time evenly: Buy the rim for your primary discipline first, then add the other shape when you notice yourself avoiding certain cars because the rim feels wrong. Two rims on one quick release is the normal long-term answer.
• Rule 4: Your rig is tight on space: Measure the sweep of a round rim at full lock against your keyboard tray, button box and monitor mounts before buying. A formula rim is usually the easier fit. Check clearance in person, not from a product photo.
• Rule 5: You run a strong direct drive base: A smaller formula rim amplifies force feedback through your hands, while a larger round rim gives more leverage and a smoother feel at the same settings. Expect to retune force feedback when you change rim shape.

Product facts that support the decision

• SimXPro XT160 + GTR Seat Bundle: Combines the high-capacity SimXPro XT160 cockpit with the SimXPro GTR Seat, universal side mounts and a double-locking slider. A stable, adjustable seating position makes it easier to test both rim shapes at full lock without the rig moving under braking or steering.
• SimXPro Profile Pedal Deck 500: Combines three 40 x 80 mm aluminium profiles with 4 mm steel side plates to create a rigid pedal platform for load-cell and hydraulic pedal systems. If you are deciding between rim shapes, you want the rest of the rig to be rigid first; a flexing pedal deck adds variables that make a rim feel worse than it is.
• MOZA SRP2 Load Cell Pedals: A throttle and brake pedal set with a 100 kg brake load cell, 15-bit angle sensing and tool-free brake tuning, built from steel and CNC aluminium for consistent braking on Windows PC. Consistent braking lets you judge a rim on steering feel alone, which is the point of the formula vs round comparison.
• SimXPro 4x Rubber Dampers M8: Mounting hardware for assembling, adjusting and fine-tuning an aluminium profile cockpit, compatible with common aluminium profile slot systems. Small hardware like this keeps a rig tight and rattle-free, so vibration through the wheel comes from the simulation rather than a loose frame.

Which shape fits you

Choose a formula rim if you

• Race open-wheel, prototype or GT cars most of the time
• Want brake bias, traction control and other adjustments under your thumbs
• Have a compact rig where a large round rim would foul other hardware
• Prefer a small diameter and a quick, direct steering feel

Choose a round rim instead if you

• Race rally, drift or road cars that need more than about 360 degrees of lock
• Regularly shuffle or cross your hands mid-corner
• Prefer a larger diameter and more leverage against force feedback
• Use few in-car adjustments and do not need a button-dense layout

Pick the rim that matches the cars you drive most, not the one that looks best in photos. If you race open-wheel or GT, a formula rim keeps your hands and buttons where you need them. If you rally, drift or drive road cars, go round. When you genuinely split your time, buy your main discipline's shape first and add the second rim later on a quick release.