How to Level a Sim Racing Rig on an Uneven Floor

Quick answer

Level a sim racing rig on an uneven floor by finding the actual high and low points first, then correcting at the contact points rather than shimming the frame randomly. If your rig rolls on casters, caster wheel leveling and a consistent contact pattern usually solve the rocking; if it is fixed, adjust the feet or baseplate height. Stop adding shims once the frame stops twisting under load, because more shims only hide the problem.

A rig that rocks or tilts on an uneven floor is not just annoying, it changes how your pedals and wheel feel because the whole frame flexes differently from corner to corner. Most people start by sliding cardboard under one leg, which works for a day and then shifts.

This guide separates what you feel from what is actually causing it, gives you a correction that holds, and tells you when to stop adjusting and change the setup instead. The same method works whether your rig sits on casters or on fixed feet.

Symptom: the rig rocks, tilts, or feels different left to right

The most common symptom is a rig that rocks diagonally when you press hard on the brake or push the wheel. You may also notice the seat leaning to one side, the pedal plate feeling higher on one corner, or the whole cockpit creeping when you get in and out.

A second symptom is inconsistent feedback: the same braking input feels different depending on which corner of the rig is loaded. That usually points to the frame twisting rather than a problem with your wheel or pedals, because a twisted frame changes the angle between your seat, pedals, and wheel.

Before you touch anything, walk around the rig and press down on each corner. Mark the corner that lifts or drops. That single observation tells you which contact point to correct.

• Press each corner while watching the opposite corner for movement.
• Check whether the rig rocks only under braking load or all the time.
• Note whether the tilt follows the floor or follows the frame.

Likely cause: floor unevenness, contact points, or frame twist

An uneven floor is rarely a single slope. It is usually a mix of a slight slope and one or two local high spots. If your rig has four contact points, three will touch and one will float, which is why it rocks diagonally.

The second cause is the contact points themselves. Casters, feet, and baseplates can sit at different effective heights if they are not adjusted consistently, or if one caster is swiveling into a different position than the others. That is a setup issue, not a floor issue.

The third cause is frame twist. If the frame is not square or a joint is loose, leveling the floor will not fix the feeling because the frame itself is loading unevenly. Check for movement at the joints before you blame the floor.

• Use a spirit level across the frame, not just along one side.
• Check that all four contact points are adjusted to the same starting height.
• Look for movement at frame joints under load before shimming.

Corrective action: correct the contact points, then the height

Start with the contact points. If your rig uses casters, make sure all four are swiveled in the same direction and that the mounting hardware is tight. Caster wheel leveling is mostly about consistency: a caster that is turned differently can change the effective height at that corner. The Caster Wheels Set uses a sturdy black steel housing with a double ball ring for smooth swiveling, which helps the wheels stay aligned instead of binding at an angle.

If your rig is fixed, adjust the feet or baseplate so all four corners start at the same height, then re-check with a level. Only after the contact points are consistent should you add a shim under the low corner, and use a thin, firm shim rather than soft material that compresses.

For height adjustment, change one contact point at a time and re-level after each change. If you are adjusting the cockpit itself, the P1X Pro Simracing cockpit is built on aluminum profile with a modular design, so you can adjust and re-tighten sections without rebuilding the whole frame.

• Tighten all contact-point hardware before adjusting height.
• Use firm shims, not soft foam or folded cardboard.
• Re-level after every single adjustment rather than at the end.

When to stop adjusting and change the setup instead

Stop adjusting when the frame no longer twists under load and the level reads consistent across the cockpit. If you are still adding shims after that point, you are likely compensating for a frame that is not square or a floor that is too far out of level for the current contact points.

At that stage, choose a different option: move the rig to a flatter area, use a baseplate or mat to create a consistent surface, or switch to contact points that are easier to adjust. If the floor is the real problem, no amount of shimming will make a soft or heavily sloped floor behave like a flat one.

If your feet or legs feel unsupported while you are driving, that is a separate comfort issue. The Sim Foot Rest is intended to be mounted next to the pedals to support the left foot when it is not on the clutch or brake, and it adjusts from 55 to 85 degrees, so you can set it without changing the rig's level.

• If you need more than a thin shim at one corner, change the surface or the contact points.
• If the frame still twists after leveling, check squareness and joint tightness.
• Do not use leveling to fix a floor that is soft or moving under load.

Leveling diagnosis checklist

• Rig rocks diagonally under braking: One contact point is floating or sitting higher than the others. Press each corner to find the floating one, then correct that contact point first. If the rocking stops after correcting one corner, you are done.
• Rig tilts to one side even when stationary: The floor has a slope or one side of the frame is adjusted lower. Check the level across the frame, then adjust the low side in small steps. If the tilt returns after tightening, check frame squareness before adding more shims.
• Rig still twists after leveling: The frame itself is loading unevenly, likely from loose joints or a non-square frame. Re-tighten joints and check the frame before adjusting the floor again. If twist continues, stop leveling and fix the frame or move the rig to a flatter surface.

Parts that help with leveling and support

• Caster Wheels Set: Built with a sturdy black steel housing and a robust trunnion featuring a double ball ring for smooth swiveling, with a 50 mm wheel diameter and 40 kg load capacity per wheel, sold as a set of four. Consistent swiveling helps all four contact points stay aligned, which makes caster wheel leveling more predictable on an uneven floor.
• P1X Pro Simracing cockpit: Aluminum profile construction with extreme rigidity, a modular design, and easy assembly, with wheelmount and monitor mount options. A rigid, modular frame holds its level better under braking and steering load, and is easier to re-adjust when you change contact points.
• Sim Foot Rest: Mounts on profiles or baseplates with slotted holes, is intended to sit next to the pedals for left-foot support, and adjusts from 55 to 85 degrees with dimensions of 300 x 70 mm. Supporting your left foot reduces the urge to brace against the frame, which helps you avoid shifting the rig and disturbing its level.

Leveling a sim racing rig on an uneven floor is a process of correcting contact points first, then height, and stopping once the frame no longer twists. If you find yourself adding shim after shim, the floor or the frame is telling you to change the setup rather than adjust it again.