How to Remove the Sprocket Off a BMX Bicycle

Written by racquel ricci
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How to Remove the Sprocket Off a BMX Bicycle
Disassembling a BMX bicycle is simpler than a street bike. (bmx image by Claudio Calcagno from

BMX biking is an increasingly popular sport that requires frequent tune ups and repair to the bicycles. Fortunately, BMX bicyles are simpler than most mountain or road bikes in their assembly and easier to repair. When trying to remove the sprocket off of a BMX bicycle you only need to follow a few steps.

Skill level:

Things you need

  • Allen wrench
  • Large wrench or large vice grips
  • Flat head screwdriver
  • Hammer
  • Rubber gloves (optional)

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  1. 1

    Find a hex wrench that fits into the bolt that is on the opposite side of the crank. You will find the crank between the pedals and the bolt will be opposite the crank. Try different sizes of hex wrenches until you find one that fits snugly inside the bolt.

  2. 2

    Remove the bolt that is on the opposite side of the crank with the hex wrench. Turn the wrench counter-clockwise to remove the bolt. Wear rubber gloves if you do not want to get oil or grease on your hands. Remove the crank by pulling it directly off of the bottom bracket and spindle, which is the metal piece that the pedals are on.

  3. 3

    Remove the nut that is directly behind the crank just removed by using a large wrench or vice-grips.

  4. 4

    Unscrew the bolt that is behind the nut that was just removed. If the bolt is stuck, use a hammer and flathead screwdriver to stick between the bolt and the bearing seal behind it and hammer the screwdriver between the bolt and the bearing seal to loosen the bolt. Remove the bolt.

  5. 5

    Remove the bearing seal, the other side of the crank and the bearings by unbolting the nuts that are holding them in. Unbolt the nuts by turning them counter clockwise with a wrench. Remove the sprocket by pulling it off of the spindle attached to the frame.

Tips and warnings

  • There will typically be grease or oil on the bicycle parts. Wearing rubber gloves while removing the sprocket will prevent the oil and grease from getting onto your skin.

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