Bottom brackets are some of the most overlooked components on the bike when we are looking to upgrade our bike's performance. The Wheels Manufacturing BBRight Thread Together Bottom Bracket features premium build quality and is packed with Enduro ABEC-3 bearings for smooth performance and long product life. The two machined aluminum cups thread together for easy maintenance and a stable fit, and the BBRight Thread Together Bottom Bracket works with 24mm or 30mm spindle diameter cranksets.