How to Fix a BMX Sprocket

Written by david montoya
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How to Fix a BMX Sprocket
A malfunctioning sprocket is often caused by dirt build-up. (bicycle wheel image by Horticulture from

BMX bikes are known for their toughness and durability, one reason they are used at extreme sports events. The BMX, like all bikes, eventually will suffer the problems associated with "wear and tear," so regular maintenance is a necessity. A malfunctioning rear sprocket -- the rear mechanism to which the chain attaches -- can require replacement if it is dented, cracked or missing some teeth. Sprockets also can be loose or just dirty. A repair job in this situation requires only a thorough cleaning and a slight readjustment.

Skill level:

Things you need

  • Brush
  • Bucket
  • Grease
  • Hot water
  • Degreaser
  • Soap
  • Toothbrush
  • Towel
  • Wrench

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  1. 1

    Remove the bolts attaching the rear wheel to the sprocket and chain with your wrench. Keep the bolts in a specific spot to avoid misplacing them.

  2. 2

    Lift the chain from the sprocket so the wheel is free to be removed from the rest of the bike.

  3. 3

    Inspect the sprocket for damage. If you use your BMX bike for tricks or other types of riding that puts large amounts of pressure on the bike, inspect it for cracks or missing teeth. Sprockets are generally sturdy pieces of metal and will not show signs of damage. If your chain is slipping because the teeth have worn down too low, the entire sprocket must be replaced.

  4. 4

    Clean off any dirt on the sprocket with a bucket of hot water, mild soap and a hand brush. Brush in a circular motion and continue until all dirt and grime build-up has been removed. Dry off with a towel.

  5. 5

    Spray degreaser onto the sprocket and let the sprocket sit for several minutes. This will give the degreaser an opportunity to break down any grease and oils. Wipe away with a clean towel when you're done.

  6. 6

    Place the chain back onto the sprocket and bolt on the tire. Continue turning until the rear bolts are tightly in place. A sprocket problem also could occur if one of the rear bolts is loose. Check the bolts on a regular basis to keep all the mechanisms in the rear wheel working properly.

Tips and warnings

  • Clean your chain while your fixing your sprocket. These two pieces depend on each other. Any problems with the chain will invariably affect the sprocket. Use a toothbrush, hot water, soap, and degreaser to clean the chain. Apply a small amount of bicycle grease to the chain to reduce friction between the two parts.

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