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HomeBottom Bracket

If your cranks have lateral play in them, it is tie for your bottom bracket to be replaced or overhauled. Most of the bottom brackets produced since 1993 are non-serviceable sealed bearing units. However, you can adjust older bottom brackets if there is bearing play. To diagnose the condition of the bottom bracket, remove both crank arms and turn the spindle in your fingers. If it spins with friction, it is likely that there is no grease lubricating the bearings. If the spindle rocks inside the cups, the bottom bracket is too loose and needs to be adjusted.

Consider replacing the bottom bracket with a newer sealed cartridge unit that requires little or not maintenance after installation, but know that you will have to continue to purchase these and throw them away when they are used (5,000 to 20,000 miles, depending on riding conditions). In contrast, the re-buildable bottom brackets require regular maintenance (one overhaul every year or every 1,ooo to 5,000 miles), but if properly maintained can last more than 25 years. Consult with your local bike shop or co-op, as there are many different sized bottom brackets with different spindle constructions.

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Recommende Tools:

  • Lockring wrench
  • Adjustable cup tool
  • Fixed cup tool
  • Cartridge bottom bracket tool (for your brand of bottom bracket)
  • Bottom bracket external bottom bracket cup wrench (for your brand of bottom bracket)
  • Bottom bracket external bottom bracket socket (for your brand of bottom bracket)
  • Bottom bracket lockring tool (for your brand of bottom bracket)
  • Crankset & bottom bracket tool (for your brand of bottom bracket)
  • BB30 bottom bracket tool (for your brand of bottom bracket)

Click HERE to see Park Tools Instructions

Click HERE to view video