Upgrade your drivetrain with the Shimano BB-UN300 Square Taper Bottom Bracket, engineered for smooth pedaling, long-lasting durability, and dependable performance. Designed with sealed cartridge bearings, the BB-UN300 minimizes maintenance while providing efficient power transfer for road bikes, mountain bikes, hybrid bikes, and commuter bicycles.

Its robust steel spindle and precision bearings ensure reliable operation in all riding conditions, making it an excellent replacement or upgrade for bikes using square taper cranksets.

Key Features

Genuine Shimano BB-UN300 square taper bottom bracket
Sealed cartridge bearings for smooth, maintenance-free performance
Durable steel spindle for reliable power transfer
Low-friction design improves pedaling efficiency
Corrosion-resistant construction for long service life
Easy installation and dependable everyday performance
Suitable for road, MTB, hybrid, trekking, and city bikes

Benefits

Smooth and efficient pedaling performance
Maintenance-free sealed bearing design
Excellent durability for everyday riding
Reliable Shimano quality and precision
Compatible with most JIS square taper cranksets

Bottom Bracket

Shimano BB-UN300 Square Type Bottom Bracket