Bottom brackets
Shimano BB-UN300 Bottom Bracket
BSA 68 mm · 110 mm spindle
Compatibility: reviewed
Known specifications can be used by the compatibility engine.
Retailer offers
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Technical data
Specifications
- Supported BB shells
- BSA-68
- Supported crank spindles
- Square Taper
- Spindle length
- 110 mm
Catalog trust
Evidence and freshness
Technical-source dates and retailer offer checks are separate. A retailer check does not validate compatibility.
Report a correction- Technical review
- Jul 28, 2026
- Compatibility review
- Reviewed Jul 28, 2026
Approved technical sources
- Shimano FC-RS200 crank specification
- productinfo.shimano.com/en/spec/road-cranksetManufacturerSource checked Jul 28, 2026Evidence reviewed Jul 28, 2026
- Shimano lifestyle and active bottom-bracket specification
- productinfo.shimano.com/en/spec/lifestyle-active-bottom-bracketManufacturerSource checked Jul 28, 2026Evidence reviewed Jul 28, 2026
- Shimano package-code and label reference
- si.shimano.com/en/pdfs/sm/CY25_GENUINE_PARTS/CY25_GENUINE_PARTS_O.pdfManufacturerSource checked Jul 28, 2026Evidence reviewed Jul 28, 2026