Shimano BB-MT501 English Bottom Bracket - 68/73mm
Bottom Brackets
Shimano BB-MT501 English Bottom Bracket - 68/73mm
Shimano BB-MT501 English Bottom Bracket - 68/73mm
The Shimano BB-MT501 is the threaded English bottom bracket for Shimano Deore and compatible MTB cranksets using the Hollowtech II interface, the outboard bearing system that positions sealed cartridge bearings outside the frame shell for better weight distribution and pedaling stability. Read the overview
At a glance
- Shell
- English threaded
- Bearing Type
- Outboard sealed cartridge
- Model
- BB-MT501
- Interface
- Hollowtech II (24mm axle)
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Overview
What Makes the Shimano BB-MT501 the Right MTB Bottom Bracket?
The Shimano BB-MT501 is the threaded English bottom bracket for Shimano Deore and compatible MTB cranksets using the Hollowtech II interface, the outboard bearing system that positions sealed cartridge bearings outside the frame shell for better weight distribution and pedaling stability. Shimano describes the BB-MT501 as having better sealing and rotation, which helps keep mud, water, and grit out of the bearings, and says it delivers high driving efficiency.
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, M6100, and compatible series. A straightforward, reliable replacement or upgrade for any threaded English MTB frame running a Shimano Hollowtech II crankset.
All the specs
MPN EBBMT501B
- 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/M6100 and compatible Hollowtech II MTB cranksets
FAQ
Good questions
Get to know Shimano
There's more to Shimano than this one product. Our Shimano page has the full Shimano lineup we carry and more about the brand.
Visit the Shimano page →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 tier cranksets. For Deore XT M8000/M8100 and SLX M7100 cranksets, Shimano lists the BB-MT801 as the recommended threaded 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.
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