Est. 1982

Shimano Deore BB-MT501 63/73mm BSA Bottom Bracket


The Shimano MT801 is a bottom bracket designed to fit a 24 mm axle crankset into a frame with a BSA bearing. With the included spacers, it is suitable for shell width of both 73 mm and 68 mm.

With better sealing and rotation the Deore bottom bracket delivers high efficiency.


  • 68 and 73mm BB compatible
  • Use with 24mm axle cranksets
  • Anodised bearing cups
  • High-quality bearings
  • Sealed for long service life
  • Resin bottom bracket centre tube
  • Replacement for previous SM-BB52 model