Knee Sliders Explained: What They Do and When to Replace Them

Knee sliders look like a small detail until you're leant over mid-corner without them. Here's what they do, whether you need them, and when a set is finished.

What knee sliders do

A knee slider is a replaceable puck attached to the knee panel of a race suit. It does two jobs. It gives you a physical reference point for lean angle, and it takes the contact so the leather underneath doesn't. Without one, the knee panel wears through on the exact spot that touches down most, and once leather is gone it isn't coming back.

Do you need knee sliders for road riding

Honestly, no. Sliders are built for track use where knee-down is a normal part of cornering. On the road they're mostly there because the suit came with them, and dragging a knee on public roads isn't something worth chasing. If you're heading to your first track day, that's when they start earning their place.

When to replace them

Once a slider has worn flat, or worn through to the backing on one side, it has stopped doing its job properly. A heavily worn slider gives less accurate feedback about lean angle, and eventually the leather starts taking contact instead of the puck.

Check them after any session where you were consistently getting a knee down, not just after a crash. Uneven wear between left and right is normal if your circuit favours one direction, and it means you'll often replace them as a pair even when only one looks finished.

Fitting replacements

Most knee sliders attach to the Velcro panel on the knee of the suit. To replace them, peel off the worn slider and press the new one firmly onto the same Velcro panel. What you can't easily do at home is repair the panel if the leather has already worn through, so it is better to replace worn sliders before that happens.

If you're not sure whether yours are standard Motorce fittings or whether the panel needs looking at, book in with us rather than guessing.

What comes with a Motorce suit

Every Motorce race suit includes external knee sliders as standard, positioned against your own measurement profile so they sit where your knee actually is rather than where a stock pattern assumes. Full specification on the custom race suits page.