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XT BB-MT800 BSA Bottom Bracket - Bike Build

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Why We Like the XT BB-MT800 BSA Bottom Bracket

Let's forgo the creaks from our bike's center and retire our old bottom bracket. Shimano's XT BB-MT800 BSA Bottom Bracket allows us to mount our Shimano crankset into mountain bike frames with a threaded bottom bracket shell. This bottom bracket sees the best of Shimano's craftsmanship, and it uses durable seals and small ball bearings that will keep our cranks rotating smoothly.


  • When it's time, switch up bottom brackets for Shimano's replacement
  • Threaded design promises a smooth ride and fewer creaks
  • XT-level design is a workhorse that doesn't break the bank
  • Fits frames with 68 and 73mm BSA threaded bottom bracket shells
  • Item #SHIU1D2
Shell Type
BSA threaded
Shell Width
68mm, 73mm
English (BSA)
1 BB assembly, 1 dust sleeve, 1 socket installation tool, 2 spacers
Claimed Weight
2.9oz (82g)
Manufacturer Warranty
2 years