Brakes
What is a Disc Rotor?
The metal disc bolted to the wheel that the brake pads clamp onto.
Simplified schematic — not to scale.
In plain English
A disc rotor is a thin, slotted metal disc attached to the wheel hub. The brake caliper clamps its pads onto this disc rather than the wheel rim.
A simple analogy
“It's a sacrificial dance floor — built to take the friction so your rim and tyre don't have to.”
How it works
As the wheel spins, the caliper squeezes pads against the rotor's flat faces, slowing the wheel through friction while spreading heat out through its vents.
Signs of trouble
- ⚠High-pitched rubbing noise as the wheel spins
- ⚠Visible warping or wobble in the disc
- ⚠Blueish discolouration from overheating
Rough UK cost
£15 – £45 per rotor
Always get a written quote. Prices vary by bike, region and parts brand.
Heads up: Bikeautonomy is for general guidance only. If your bike is behaving oddly or you're not confident, get it looked at by a qualified bike mechanic.