Clicking, grinding or squeaking noises
Where e-bike noises usually come from: the chain and gears, the brakes, loose bolts, the cranks and bearings, or the motor.
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Noises are easier to find when you know when they happen. Notice whether it's when you pedal, brake, coast, go over bumps, or only when the motor is helping. Hiboy's advice for scooters works for bikes too: a scraping sound that follows the wheel's rotation points at the wheel or brake, not the electrics (Hiboy common problems).
When you pedal
- A dry or dirty chain squeaks or crunches. Scrub it with a brush and degreaser and lube the rollers, keeping lube off the brakes (Shimano maintenance tips, Velotric troubleshooting).
- A chain that slips or skips under load can be worn. Check it with a chain wear tool, since a worn chain also wears the cassette and chainrings (Park Tool chain wear). Bosch lists the chain among an e-bike's wearing parts (Bosch owner guide).
- Push and pull each crank arm. Shimano says there should be no play or clicks (Shimano maintenance tips). Check the pedals too (Velotric troubleshooting).
When you brake
Squealing points to the pads or rotor, and metal-on-metal grinding usually means the pads are worn out (Shimano maintenance tips). New brakes can be noisy while they wear in (Lectric). See brakes.
When you coast or spin the wheel
A rub that comes round with the wheel can be a bent rotor (Shimano maintenance tips). Crunchy or rough bearings, or play, need service (Shimano maintenance tips).
Over bumps
Rattles are usually something loose: fenders, racks, bags and loose items (Velotric troubleshooting). Check the bolts you can see.
From the motor
A steady hum or grinding from a wheel: check for debris, and stop riding if it persists (Velotric troubleshooting). Motor noise that comes with an error code, sudden power loss, vibration or overheating means stop and get it serviced (Hiboy common problems). Don't open the motor.
Get it checked if
- The noise comes from inside the motor or a bearing.
- Something feels loose when you rock the bike side to side, or a crank has play (Shimano maintenance tips).
Sources
- 14 common electric scooter problems and fixes, Hiboy
- Spring cleaning and maintenance, Shimano
- Electric bike troubleshooting guide, Velotric
- When to replace a worn chain, Park Tool
- eBike owner's guide (US), Bosch eBike Systems
- New bike brakes rubbing or squealing, Lectric eBikes
Stuck after these checks? Find a shop near you.
If these steps didn't fix it, find a shop near you in our partner network of shops that work on electric rides.
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