Bottom bracket Shimano BB-UN300 square axle 127.5mm - EBBUN300KB27X

Shimano ’s BB-UN300 bottom bracket (part no. EBBUN300KB27X) is a reliable and cost-effective solution for bikes fitted with a square-axle crankset. Designed for frames with a BSA-standard threaded bottom bracket (68 mm), it offers excellent strength and enhanced durability, making it ideal for everyday use on road bikes, mountain bikes or city bikes.

Featuring a 127.5 mm JIS square taper spindle, this model is particularly suited to triple cranksets or older systems Shimano. Its sealed cartridge design with steel bearings ensures smooth rotation whilst minimising maintenance. Thanks to its sturdy steel and aluminium construction, it effectively withstands mechanical stress and outdoor conditions.

Versatile and easy to install, the BB-UN300 is an excellent choice for replacing a worn bottom bracket whilst maintaining stable and efficient pedalling.

Key features:

• 127.5 mm JIS square spindle, ideal for triple cranksets
• BSA threaded standard (68 mm), compatible with many frames
• Sealed cartridge bearings for greater durability
• Robust steel/aluminium construction
• Low maintenance and simple installation
• Excellent value for money

TECHNICAL SPECIFICATIONS

threaded bottom bracket cup BSA-style frame mounting 1.37x24
Square taper axle length 127.5mm
Supplied with crank bolts