BB-UN300 Bottom Bracket - English 68 x 122.5mm Spindle Square Taper JIS 50mm Chainline

The Shimano BB-UN300 English bottom bracket is a top - notch choice for your bike. It features a 68mm shell width and a 122.5mm square taper JIS spindle, with a 50mm chainline. This bottom bracket fits JIS square - taper cranksets perfectly. The spindle is hollow, which not only reduces weight but also maintains strength. Note that the crankarm fixing bolts are sold separately. It comes in a sleek black color, adding a touch of style to your bike. Technical specs include a 1.37 - inch bottom bracket shell inner diameter, an English BB/frame interface, and more.

Using the Shimano BB-UN300 bottom bracket is easy. First, make sure your bike frame is compatible with an English bottom bracket and has the right shell width of 68mm. Fit the bottom bracket into the shell carefully. When attaching the JIS square - taper cranksets, keep in mind that you'll need to buy the crankarm fixing bolts separately. As for maintenance, regularly clean the bottom bracket to remove dirt and grime. You can use a mild detergent and a soft brush. Check for any signs of wear or damage, like loose bearings or a worn - out spindle. If you notice any issues, it's best to replace the parts as soon as possible to keep your bike running smoothly. Also, avoid over - tightening the bolts as it may damage the components.