Symptoms
- Buzzing or rattling noise while riding, especially over bumps
- Fender rubs against the tire making a repetitive sound
- Fender visibly wobbles or sits crooked
- Noise stops when pressing on the fender while stationary
Likely causes
- CommonLoose fender mounting bolts or staysVibration loosens the small bolts and stays that hold fenders in place over time.
- CommonFender positioned too close to the tireA fender set with too little clearance will rub, especially if the wheel isn't perfectly true.
- PossibleBent fender stayImpact or pressure can bend the thin metal or plastic stays out of alignment.
What to do
- Check and tighten all fender mounting bolts, including where the stays attach to the fork or frame and the fender itself.
- Spin each wheel and check the clearance between the fender and tire is even all the way around.
- Adjust the fender position if it's rubbing, loosening the mounting bolts slightly to reposition before retightening.
- Inspect fender stays for bending and carefully straighten if minor.
- Check that the wheel itself is true, since a wobbling wheel can cause intermittent fender rubbing even with correct fender position.
- Add a small amount of felt or foam padding at contact points between the fender and mounting hardware if rattling persists despite tight bolts.
- If rubbing continues due to a wobbling wheel, address the wheel trueness first as described in wheel wobble troubleshooting.
Tools and parts
- Allen key set
- Small wrench set
Bike fender mounting hardwareSearch: “bicycle fender stay replacement”
When to call a pro
A bike shop can reposition or replace fenders and stays quickly if adjustment at home doesn't stop the rubbing.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.