BB-UN300 Bottom Bracket - English 68 x 115mm Spindle Square Taper JIS

The Shimano BB-UN300 English bottom bracket is a high - quality component for your bike. It features a 68mm bottom bracket shell width and a 115mm square taper JIS spindle, perfect for JIS square - taper cranksets. The spindle is hollow, which helps reduce weight. Note that the crankarm fixing bolts are sold separately. It comes in a sleek black color. Technical specs include a 1.37 - inch bottom bracket shell inner diameter and an English BB/frame interface.

Using the Shimano BB-UN300 bottom bracket is easy. First, make sure your bike frame has an English BB/frame interface and the correct 68mm shell width. Then, install the bottom bracket into the frame. Next, attach your JIS square - taper crankset to the spindle. Remember, you'll need to buy the crankarm fixing bolts separately. When it comes to maintenance, regularly clean the bottom bracket to remove dirt and grime. Check the tightness of all parts periodically. If you notice any unusual noises or resistance while pedaling, it might be time to inspect the bottom bracket more closely. Store the bottom bracket in a dry place when not in use to prevent rusting.