Bottom brackets

Shimano SM-BB80 Bottom Bracket

BSA 68 / 73 mm

Compatibility: reviewed

Known specifications can be used by the compatibility engine.

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Technical data

Specifications

Supported BB shells: BSA-68, BSA-73
Supported crank spindles: 24mm

Catalog trust

Evidence and freshness

Technical-source dates and retailer offer checks are separate. A retailer check does not validate compatibility.

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Technical review: Jul 31, 2026
Compatibility review: Reviewed Jul 31, 2026

Approved technical sources

Shimano HOLLOWTECH II MTB bottom-bracket specifications
- productinfo.shimano.com/en/spec/mtb-bottom-bracket-hollowtech-iiManufacturerSource checked Jul 30, 2026Evidence reviewed Jul 31, 2026
Shimano crank and bottom-bracket compatibility C-449
- productinfo.shimano.com/en/compatibility/C-449ManufacturerSource checked Jul 30, 2026Evidence reviewed Jul 31, 2026
Shimano current MTB component ordering catalog
- set.shimano.co.jp/bc_catalog/mtb.pdfManufacturerSource checked Jul 30, 2026Evidence reviewed Jul 31, 2026