SHIMANOUN300 English Bottom Bracket

These are about as good as it gets for square taper bottom brackets especially for the price. Make sure the bike frame threads are clean then grease them before installing. The aluminum threads are damaged easily so start carefully and don't crossthread. Both sides should be started before tightening. The cup with the flange goes on the right or drive side and should be tightened first. The cup threads are opposite the side they are installed on. The easy way to remember is from the respective side rotate forward to remove, rearward to install. Seat and torque the right side first to 30 lb-ft then torque then left. Pick the size for your frame width either 68 or 73mm then pick the spindle width.

Shimano brand that I truster ever since

You can't go wrong with genuine Shimano parts. I had a cheap plastic cup one and that lasted a year. This is all metal and works awesome! I had a problem with the tool fitting the notches. That could have been the tool

Muy fácil de instalar y su calidad muy superior, al ser balero sellado si se siente la diferencia en comparación de los cartuchos de balín suelto, el pedaleo es más suave y sin crujidos.

Installed nicely. Exact fit. Ultra high quality. 65g lighter than the stock BB that came on my older Specialized bike. Would buy again.