Shimano DURA-ACE R9100 Bottom Bracket - Italian

Item: 50-4745
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The R9100 bottom bracket by Shimano provides smoother rotation with 50% less drag, due to its new seal construction. It also features smaller ball bearings, which are positioned on the outside for lighter weight and better weight distribution.

Italian threaded bottom brackets are only compatible with frames that have an Italian threaded bottom bracket shell, because they screw in the opposite direction from a standard BSA bottom bracket


  • Smaller ball bearings for lighter weight
  • Advanced seal construction for smoother rotation
  • Sealing ensures 50% less drag
  • Shell width: 70mm
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