Shimano BB-UN300 BSA 113 mm / 68 mm Square is a cartridge bottom bracket designed for square taper cranksets and frames with a BSA threaded bottom bracket shell.
Key Features
Construction and Design
The BB-UN300 features a sealed cartridge bearing design that helps protect internal components from dirt, water, and debris. Its durable steel spindle and robust construction provide reliable long-term performance.
Main Functions
The 113 mm JIS square taper spindle is compatible with a wide range of Shimano and other square taper cranksets. Sealed bearings ensure smooth rotation and require minimal maintenance.
Usage and Compatibility
Designed for frames with a 68 mm BSA threaded bottom bracket shell. Suitable for city, touring, mountain, and road bicycles using JIS square taper cranksets.
Additional Features
A chainline stabilizing design helps maintain consistent drivetrain performance. The cartridge construction allows for straightforward installation and replacement.
Summary
The Shimano BB-UN300 BSA 113 mm / 68 mm is a dependable bottom bracket for riders seeking durability, smooth operation, and low maintenance. It is well suited to a wide range of bicycles equipped with square taper cranksets and BSA-threaded frames.
