Bottom bracketVerified spec
Shimano Shimano (Lifestyle) BB-UN300
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Overview
- Brand
- Shimano
- Series
- Shimano (Lifestyle)
- Model
- BB-UN300
- Model number
- BB-UN300
- Type
- Bottom bracket
- Years
- 2020 to 2026
Compatibility
- Spindle
- square_taper
- Bb shell
- bsa_68, bsa_73
Specifications
- Threaded
- true
- Right cup
- aluminum/steel
- Axle lengths
- 107, MM110, LL113, D-H, 117.5, XL118, D-NL122, D-EL127, LL123
- Shell widths mm
- 68, 73
- Spindle material
- steel, Bonderlube
- Left adapter material
- aluminum
Square taper cartridge bottom bracket. Several axle lengths are offered only in crank fixing bolt versions (footnotes on printed page 193 of the 2026-2027 handbook). Years are the first and last Shimano specification handbook editions that list this model number (editions checked: 2008 to 2026-2027). Shimano publishes no US price in these documents; bearing material is not stated.
For sale now
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