BB-UN300-E Bottom Bracket - English 68 x 122.5mm Spindle Square Taper JIS For E-Type Front Derailleur

The Shimano BB-UN300-E bottom bracket is a great choice for your bike. It features a 122.5mm square taper JIS spindle and is designed for E-Type front derailleurs. This bottom bracket fits JIS square-taper cranksets. The crankarm fixing bolts are sold separately, and it has a hollow spindle for reduced weight. Technical specs include a 1.37-inch bottom bracket shell inner diameter, English BB/frame interface, 68mm BB shell width, square taper JIS spindle interface type, and it comes in a sleek black color.

Using this Shimano bottom bracket is easy. First, make sure your bike frame has an English BB/frame interface and a 68mm BB shell width. Then, install the bottom bracket into the frame carefully. When attaching the cranks, remember that the crankarm fixing bolts are sold separately. As for maintenance, keep it clean by wiping it down regularly with a dry cloth. Avoid exposing it to excessive moisture as it can cause rust. If you notice any unusual noises or looseness during use, check the installation and tighten the bolts if necessary.