BB-UN300 BOTTOM BRACKET

The BB-UN300 square taper bottom bracket was launched by Shimano as successor of the models BB-UN26 and BB-UN55.

It covers a wide range of applications, from Touring and City bikes to older Road and Mountain bikes. BB-UN300 is available with BSA thread and in different axle lengths. 

Features

• Bearings: steel
• Axle Material: steel
• Bottom Bracket Cup Material: aluminium (left), aluminium / steel (right)
• For all cranks with JIS square mount
• Crank bolts not included
• Narrow body allows clearance for cable routing under the bottom bracket