The Moza R5 clamp attaches to your desk in about five minutes with three main parts

The Moza R5 is a racing wheel base that mounts to your desk using a C-clamp mechanism. The clamp assembly has three pieces: the main clamp body, the mounting plate that bolts to the wheel base, and the extension arm that holds everything at the right angle. You do not need tools beyond the hex key that comes in the box, and the whole process takes longer to plan than to execute.

The clamp works by tightening against the underside and top surface of your desk edge, so it works best on desks between 0.6 and 3.15 inches thick. If your desk is thinner than that or has a curved edge, the clamp will not grip securely. Thicker desks are fine — the clamp just needs something solid to squeeze.

Key Takeaways

  • The Moza R5 clamp has three parts that screw together in a specific order: the main clamp body, the extension arm, and the mounting plate that connects to the wheel base.
  • Your desk edge must be between 0.6 and 3.15 inches thick for the clamp to grip properly; curved edges or very thin surfaces will cause the clamp to slip.
  • Tighten the clamp screw by hand first, then use the included hex key to finish tightening until the clamp is snug but not so tight that you cannot move it into position.
  • The wheel base bolts to the mounting plate with four bolts, and you should hand-tighten these first before using the hex key to avoid cross-threading.
  • Once installed, test the clamp stability by pushing on the wheel base from different angles before you use it for racing.

Assembling the clamp body and extension arm

Start by laying out all the parts on a flat surface. You will have the main clamp body (the piece with the screw mechanism), the extension arm (a long metal rod), and the mounting plate (a flat square with four bolt holes). The hex key is usually taped to the inside of the clamp body or packed separately in the box.

Insert the extension arm into the socket on the main clamp body. This socket is the round opening on the side of the clamp — the arm slides in and is held by a set screw. Slide the arm all the way in until it stops, then use the hex key to tighten the set screw. You do not need to overtighten this; snug is enough. The arm should not wobble or rotate when you push on it.

Screw the mounting plate onto the end of the extension arm. The arm has a threaded hole at the tip, and the mounting plate has a threaded stud on its underside. Hand-tighten the plate first to make sure the threads are aligned, then use the hex key to tighten it fully. Again, snug is the target — you are not trying to strip the threads.

Positioning the clamp on your desk

Choose a spot on your desk edge where you have at least 12 inches of clear space on both sides of the clamp. The wheel base will extend forward from the mounting plate, so make sure nothing is directly in front of where it will sit. Many people clamp on the right side of the desk if they are right-handed, but this is personal preference.

Loosen the main clamp screw by turning it counterclockwise until the clamp jaws are wide enough to fit over your desk edge. You should be able to slide the clamp on by hand without forcing it. Position the clamp so the desk edge sits in the middle of the jaws — not too far forward, not too far back.

Once the clamp is in position, hand-tighten the screw clockwise until you feel resistance. Do not use the hex key yet. The clamp should be snug enough that it does not slide, but loose enough that you can still adjust the angle of the mounting plate if needed. This is the moment to get the height and angle right before you lock it down.

Bolting the wheel base to the mounting plate

The Moza R5 wheel base has four bolt holes on its back face. These holes line up with the four holes on the mounting plate. You will need the four bolts that come with the wheel base — they are usually M6 or M8 bolts depending on your R5 model.

Insert the bolts through the wheel base holes and into the mounting plate. Hand-tighten all four bolts in a crisscross pattern — tighten the top-left, then bottom-right, then top-right, then bottom-left. This prevents the wheel base from tilting as you tighten. Once all four are hand-tight, use the hex key to tighten each one a quarter turn more in the same crisscross pattern. Repeat this until all four bolts are snug.

Do not overtighten the bolts. If you strip the threads, you will have to remove the wheel base and repair the mounting plate, which is a hassle. Snug means you cannot turn the bolt by hand, but the hex key does not require heavy pressure.

Final tightening and stability check

Now that the wheel base is bolted on, use the hex key to fully tighten the main clamp screw. Turn it clockwise until the clamp is very snug against your desk. You should not be able to move the clamp by hand, and pushing on the wheel base should not cause any flex or creaking in the clamp itself.

Test the installation by pushing the wheel base forward, backward, left, and right with moderate force. It should not move. Grab the rim of the wheel and try to rotate it — the clamp should hold steady. If anything shifts or creaks, loosen the clamp screw slightly and retighten it, or check that all four bolts on the mounting plate are equally tight.

If your desk is very thin or has a soft surface like laminate, the clamp may leave marks over time. You can place a thin rubber pad under the clamp jaws to distribute pressure and protect the desk finish. Many users cut a small piece of rubber shelf liner for this purpose.

Adjusting the angle and height after installation

The extension arm can be rotated to change the angle of the wheel base. If you need to adjust the angle after the clamp is fully tightened, you will need to loosen the set screw on the main clamp body, rotate the arm to the angle you want, and retighten the set screw. This is easier to do before you fully tighten the main clamp screw, so get the angle right during the positioning step if possible.

The height of the wheel base is set by where you clamp on the desk edge. If you need to raise or lower the wheel base, you will have to loosen the main clamp screw, slide the clamp up or down on the desk edge, and retighten. Most people find the right height on their first try by sitting in their racing position and adjusting before final tightening.

Removing the clamp without damaging your desk

When you need to remove the clamp, loosen the main clamp screw by turning it counterclockwise until the jaws are loose enough to slide off the desk edge. Do this slowly and support the wheel base with your other hand so it does not drop. Once the clamp is off, you can unbolt the wheel base from the mounting plate if you want to store them separately.

If the clamp has left marks on your desk, they are usually just pressure marks that fade over a few hours or days. Wipe the area with a damp cloth and let it dry. If the marks are permanent, a furniture touch-up marker or wood stain can blend them in, depending on your desk material.

Frequently Asked Questions

Can I use the Moza R5 clamp on a glass desk?

Glass desks are not recommended because the clamp cannot grip glass securely — it will slip under load. If your desk has a metal or wood frame, you can clamp to the frame instead of the glass top. Some users clamp to a wooden shelf or table next to the glass desk as a workaround.

What if my desk is too thick for the clamp?

If your desk is thicker than 3.15 inches, the clamp jaws will not close far enough to grip. You can clamp to a shelf, a monitor arm, or a separate mounting board clamped to the desk instead. Some users build a small wooden platform that sits on the desk and clamp to that.

Do I need to use threadlocker on the bolts?

Threadlocker is not required, but some users apply a small amount of removable threadlocker (like Loctite Blue) to the four bolts that hold the wheel base to the mounting plate. This prevents them from loosening over time if you move the wheel base frequently. Do not use permanent threadlocker, as you may need to remove the bolts later.

How tight should the main clamp screw be?

Tight enough that the clamp does not move when you push on the wheel base, but not so tight that you need a lot of force with the hex key. If you over-tighten, you risk stripping the screw or damaging your desk. Snug is the right target — you should not be able to move the clamp by hand, but the hex key should turn smoothly without requiring heavy pressure.

Can I clamp the Moza R5 to a standing desk?

Yes, but you should clamp it to the desk in a lowered position or to the frame rather than the top surface. If you raise and lower the desk frequently, the clamp may loosen over time. Check the clamp screw tightness after a few weeks of use if you have a motorized desk.