Symptoms
- Faint rubbing or ticking sound with each wheel rotation
- Noise changes or disappears when the brake lever is squeezed slightly
- Rubbing is worse in one section of the wheel's rotation
- Started after removing and reinstalling the wheel
Likely causes
- CommonBrake caliper not centered over the rotorEven a small misalignment causes one pad to contact the rotor lightly at all times.
- CommonSlightly bent or warped rotorA small bend, often from an impact or improper storage leaning on the rotor, causes intermittent rubbing.
- PossibleWheel not fully seated in the dropouts or thru-axle not tightA wheel that isn't perfectly centered will throw off rotor-to-caliper alignment.
What to do
- Check the wheel is fully seated in the dropouts and the quick release or thru-axle is tight and properly closed.
- Spin the wheel and watch the rotor pass through the caliper to identify if it wobbles (bent rotor) or is simply off-center within the caliper.
- If the caliper is off-center, loosen the caliper mounting bolts slightly, squeeze the brake lever to center the pads on the rotor, and tighten the bolts while still holding the lever.
- If the rotor itself wobbles, use a rotor truing tool or an adjustable wrench with care to bend it gently back into alignment, working in small increments.
- Recheck for rubbing by spinning the wheel again after each adjustment.
- Avoid touching the rotor surface with bare hands, since skin oils can affect braking performance.
- If rubbing continues after centering the caliper and truing the rotor, a bike shop can address a more significantly bent rotor or a bent frame/fork mount.
Tools and parts
- Allen key set
- Rotor truing tool (or adjustable wrench)
Bike disc brake rotorSearch: “bicycle disc brake rotor replacement”
When to call a pro
A bike shop can true a rotor precisely or check for a bent caliper mount if simple centering doesn't stop the rub.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.