Shimano BB-UN300 Square Taper BB

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Your Shimano purchases with us are guaranteed to be genuine and covered by local warranty (Terms & Conditions apply).
Installation service available in-store (installation fees apply).

The SHIMANO BB-UN300 square taper bottom bracket is the successor to the BB-UN26 and BB-UN55, offering smooth, reliable performance for a wide range of bikes. Compatible with BSA threaded shells, it’s available in various axle lengths for Touring, City, Road, and older MTB setups. The axle connects to the crank via JIS square taper. Crank bolts are not included.

Specifications

• Application: City, Touring, Road, All Mountain, Cross Country
• Thread Type: BSA
• Shell Width: 68 mm
• Axle Length Options: 110 mm, 113 mm, 117.5 mm, 122.5 mm, 127.5 mm
• Axle Type: JIS square taper
• Bearings: Steel
• Axle Material: Steel
• Bottom Bracket Cup Material: Aluminium (left), Aluminium/Steel (right)

Compatibility

• Suitable for all cranks with JIS square mount
• Recommended for: FC-M311, M315, M351, M361, M371, M430, M2000, M3000, T3010, MT100, RS200, TY301, TY501, TY701, TX801, A070, A073, U4000