BB-UN300 Bottom Bracket - English 68 x 122.5mm Spindle Square Taper JIS 47.5mm Chainline

The Shimano BB - UN300 Bottom Bracket is a high - quality choice for your bike. It features a 68mm English bottom bracket shell, a 122.5mm JIS square taper spindle, and a 47.5mm chainline. This bottom bracket fits JIS square - taper cranksets perfectly. The crankarm fixing bolts are sold separately. Its hollow spindle design not only reduces weight but also maintains strength. It comes in a sleek black color.

Using the Shimano BB - UN300 Bottom Bracket is easy. First, make sure your bike has a compatible 68mm English bottom bracket shell. Then, carefully install the bottom bracket into the shell. When attaching the cranksets, remember that you'll need to buy the crankarm fixing bolts separately. For daily use, avoid riding in extremely muddy or wet conditions as much as possible to prevent dirt and water from getting inside the bottom bracket. To maintain it, clean the bottom bracket regularly with a mild bike cleaner and a soft brush. Check the tightness of the parts periodically. If you notice any unusual noises or looseness, it might be time to take it to a professional bike mechanic for a check - up.