Prime Shimano Bottom Bracket BSA black

Prime's Threaded BB is a high quality bottom bracket designed for use with all Shimano and FSA cranksets with a 24 mm axle diameter. Designed so that the bearings rest on the axle of the crank, these BBs provide a straight load to the bearings, which means your BB will last longer. This also allows Prime to make the Threaded BB with tighter tolerances, so it runs smoother with less friction. This means you'll require less effort to make it up that hill or sprint for the line.

To keep the Threaded BB running smoother for longer, Prime uses special seals that keep water out of the bearings. They use multiple smaller seals, which reduces friction and provides a better barrier against moisture and dirt. Prime´s bearings themselves are manufactured to precision and packed with slick, waterproof grease.

All of the above combine to make the Prime Threaded Bottom Bracket the ideal choice for riders who want the best from their bike components.