E-Bike Handlebars Loose or Wobbly

In plain English

Handlebars can come loose where they clamp into the stem, or the stem can come loose on the fork. A knocking feeling when braking means the headset (the bearings that let the fork turn) has play. Most stems have the right tightness printed on them.

Watch how it's done

Video by Park Tool. It may show a regular bike: on an e-bike, switch off and remove the battery first, and unplug the motor cable before taking off a hub-motor wheel.

Work from the top. Steps go from free and easy to shop jobs. Switch the bike off before touching any connector. Tick each step as you go. Your progress is saved on this device.

1. 1Find what's looseFree Hold the front wheel between your knees and try to twist the bars. Then hold the front brake and rock the bike back and forth. A knock means headset play.
2. 2Tighten the handlebar clampEasy If the bars rotate in the stem, tighten the stem's front bolts a little at a time, crossing between them, to the torque printed on the stem.
3. 3Line up and tighten the stemEasy If the bars turn but the wheel doesn't, line the stem up with the wheel and tighten the stem's side bolts (or the single top bolt on older quill stems) evenly.
4. 4Remove headset playModerate On threadless stems: loosen the stem's side bolts, tighten the top cap bolt a little until the knock disappears and the bars still turn freely, then re-tighten the side bolts.
5. 5Get a shop to check itShop job If anything won't stay tight, a bolt looks damaged, or you're unsure, let a shop check the stem and headset.

Parts you might need

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Only buy a part if the free steps didn't fix it. Always match the voltage and connector type to your bike.

• Small torque wrench

  Tightens bolts to the exact number printed on the part, so nothing is too loose or over-tight.

  Link coming soon

• Bike multi-tool or hex key set

  Fits nearly every bolt on a bike. Useful for almost every guide here.

  Link coming soon