Bottom brackets
Shimano BB-RS501 Bottom Bracket
Italian 70 mm
Compatibility: reviewed
Known specifications can be used by the compatibility engine.
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Technical data
Specifications
- Weight
- 93 g
- Supported BB shells
- Italian-70
- Supported crank spindles
- 24mm
- Front drivetrain groups
- Shimano C455 Sora 2x9, Shimano C455 Tiagra 2x10, Shimano C455 Cues Dropbar 2x11, Shimano C455 Grx 2x12, Shimano C455 105 Mechanical 2x12
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 current component catalog package identity
- set.shimano.co.jp/bc_catalog/PDF-2/bg.pdfManufacturerSource checked Jul 28, 2026Evidence reviewed Jul 28, 2026
- Shimano front drivetrain compatibility C-455
- productinfo.shimano.com/en/compatibility/C-455ManufacturerSource 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
- si.shimano.com/pdfs/compliance/pmi/Packaging%20Labelling%20Information_Italy_BC_20231016.pdfManufacturerSource checked Jul 28, 2026Evidence reviewed Jul 28, 2026
- Shimano road HOLLOWTECH II bottom bracket specification
- productinfo.shimano.com/en/spec/road-bottom-bracket-hollowtech-iiManufacturerSource checked Jul 28, 2026Evidence reviewed Jul 28, 2026