Shimano BB-MT501 English Bottom Bracket - 68/73mm

Shimano BB-MT501 English Bottom Bracket - 68/73mm Shimano

Shimano BB-MT501 English Bottom Bracket - 68/73mm

Shimano BB-MT501 English Bottom Bracket - 68/73mm

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What Makes the Shimano BB-MT501 the Right MTB Bottom Bracket?

The Shimano BB-MT501 is the threaded English bottom bracket for Shimano Deore, Alivio, and compatible MTB cranksets using the Hollowtech II interface -- the outboard bearing system that positions sealed cartridge bearings outside the frame shell for better load distribution and more efficient power transfer. Shimano engineered the BB-MT501 with improved sealing over previous threaded MTB bottom brackets, keeping contamination out of the bearing races longer in the mud, water, and grit exposure typical of trail riding. The result is smoother rotation that holds up longer between service intervals, and higher driving efficiency on every pedal stroke.

English threaded BSA shell, 68mm and 73mm shell widths are both compatible -- the same unit installs in either width, making it versatile across a wide range of MTB frame specifications. Designed for Shimano's 24mm hollow crank axle standard used across the Deore M4100, M5100, M6000, Alivio T4000, and compatible series. Tools required: Shimano TL-FC36 or equivalent Hollowtech II BB wrench. A straightforward, reliable replacement or upgrade for any threaded English MTB frame running a Shimano Hollowtech II crankset.

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Specifications

  • Model: BB-MT501
  • Interface: Hollowtech II (24mm axle)
  • Shell: English threaded (BSA), 68mm and 73mm compatible
  • Bearing Type: Outboard sealed cartridge
  • Compatible Cranks: Shimano Deore M4100/M5100/M6000, Alivio T4000, and compatible Hollowtech II MTB cranksets
  • Installation Tool: Shimano TL-FC36 or equivalent Hollowtech II BB wrench

FAQ

Is the BB-MT501 compatible with a 73mm shell as well as 68mm?

Yes. The BB-MT501 is compatible with both 68mm and 73mm English threaded shell widths, making it usable across a wide range of MTB and hardtail frames without needing a different part number for each shell width.

Will the BB-MT501 fit a Deore XT or SLX crankset?

The BB-MT501 is designed for Deore and Alivio tier cranksets. For Deore XT M8000/M8100 and SLX M7000/M7100 cranksets, the BB-MT801 is the appropriate Shimano-spec bottom bracket. That said, all Shimano Hollowtech II MTB bottom brackets use the same 24mm axle interface, so the BB-MT501 is mechanically compatible across tiers.

How often should a Hollowtech II threaded bottom bracket be replaced?

Service life varies significantly by conditions. Riders in wet and muddy environments may need replacement annually or more frequently. In dry conditions, a well-sealed BB can last several seasons. Creaking or rough rotation are the primary indicators that replacement is needed.

Best For

Trail and all-mountain riders with English threaded 68mm or 73mm MTB frames running Shimano Deore or Alivio Hollowtech II cranksets who need a reliable sealed replacement bottom bracket.

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