Symptoms
- Clicking or buzzing sound only while coasting, not pedaling
- Noise stops immediately when pedaling resumes
- Sound seems louder than it used to be
- No noise or vibration felt through the pedals while coasting
Likely causes
- CommonNormal freehub pawl engagement soundMany hubs are simply designed to click while coasting; this is completely normal and not a defect.
- PossibleDry or under-lubricated freehub mechanismA freehub that's louder than it used to be may just need fresh grease inside.
- PossibleLoose cassette lockringA loose lockring can allow slight movement and unusual noise, though this is less common than normal freehub sound.
What to do
- Compare the noise to when the bike was new or to a similar bike model, since some freehubs (especially higher-engagement ones) are simply louder by design.
- Confirm there's no noise or roughness felt through the pedals while coasting, which would point to a bottom bracket or hub bearing issue instead.
- Check the cassette lockring is torqued to specification if you suspect looseness.
- If the sound has clearly gotten louder over time, consider having the freehub serviced with fresh grease.
- There's no need to fix a normal-design freehub click, since it's simply how many hubs operate and causes no harm.
- If you want a quieter ride, some aftermarket freehub upgrades are designed to be silent, which a bike shop can discuss.
- A loud grinding or roughness (not a clean click) while coasting warrants a bike shop inspection of the hub bearings.
When to call a pro
A bike shop can service a noisy freehub or discuss quieter freehub options if the design sound bothers you.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.