BB-UN300 Bottom Bracket - English 73 x 123mm Spindle Square Taper JIS

The Shimano BB-UN300 English bottom bracket is a high - quality component for your bike. It features a 73mm bottom bracket shell width and a 123mm square taper JIS spindle. This bottom bracket fits JIS square - taper cranksets perfectly. The crankarm fixing bolts are sold separately. Its hollow spindle design offers both strength and reduced weight. The defined color is sleek black, adding a stylish touch to your bike. Technical specs include a 1.37 bottom bracket shell I.D. and an English BB/frame interface.

Using this Shimano BB - UN300 bottom bracket is straightforward. First, make sure your bike has a compatible JIS square - taper crankset. If you don't have the crankarm fixing bolts, you'll need to purchase them separately. Install the bottom bracket into the 73mm shell on your bike frame. When it comes to maintenance, keep it clean by wiping it down regularly. Avoid getting it wet for long periods as this can cause rust. If you notice any unusual noises or looseness during use, check the installation and tightening of the parts. With proper care, this bottom bracket will serve you well for a long time.