How to Install Bicycle BMX Rear Bearings

Written by philip foster
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How to Install Bicycle BMX Rear Bearings
Increase the speed of the BMX with bearing maintenance. (bmx on the street image by Alexey Klementiev from

Each wheel of your BMX bike houses numerous ball bearings. The bearings allow the wheels to rotate as you pedal the bike forward. Riding on a wet terrain may cause your rear wheel bearings to retain moisture. If not adequately dried, the bearings will rust. According to Vital BMX, lubricating your bearings on a regular basis will help to ensure a smooth ride. (See References 1) If your wheels begin to creak, you may need to replace the bearings entirely.

Skill level:

Things you need

  • 17mm wrench
  • 15mm cone wrench
  • Rag
  • Waterproof bike grease

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  1. 1

    Loosen the rear axle nuts halfway using the 17mm wrench. Remove the back wheel from the rear dropouts of your BMX. Place the wheel onto a flat worktable with the left hub facing up. Align the 15mm cone wrench around the cone flats of the wheel hub.

  2. 2

    Fasten the 17mm wrench around the locknut of the wheel hub. Push the handles of the tools towards one another to completely loosen the locknut. Remove the locknut and cone.

  3. 3

    Hold the wheel vertically while sliding out the axle. Insert your thumb and forefinger into the wheel hub to pull out the old or rusted bearings. Rub the inside of the hub with a dry rag to remove any built up residue.

  4. 4

    Insert the new bearings into the wheel hub with your thumb and forefinger. Cover the bearings with a layer of waterproof grease. Place the axle through the centre of the hub.

  5. 5

    Tighten the cone and locknut to secure the axle in place. Align the back wheel onto the rear dropouts of your BMX bike. Tighten the axle nuts with the 17mm wrench. Store your BMX in a dry location to prevent bearing rust.

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