Shimano bbun300 square bottom bracket

The BB-UN300 square bottom bracket was released by Shimano as a successor to the models
BB-UN26 and BB-UN55. It covers a wide range of areas of use, ranging from bicycles
from touring and city riding to vintage road and all-mountain bikes. The BB-UN300 is available
with BSA thread and in different shaft lengths. In this type of crankset,
the axle of the housing and the bottom bracket are connected by a square cone. Delivery does not include the bottom bracket screw.

Technical informations :

• Bearing: steel
• Axle material: steel
• Bearing material: aluminum (left), aluminum / steel (right)
• Case width: 68 mm / 73mm
• Length: 110 mm / 113mm / 118mm / 122mm