Smooth and sealed: The Race Face BB Cinch 30 mm BB92 bottom bracket. It is compatible with Pressfit shells such as BB92, BB107 and BB124 and has 19 retainer bearings that are filled with Phil Wood grease and are super smooth. The bearings are completely sealed and thus protected from corrosion. The inner sleeve serves to provide protection from moisture getting into the shell. Race Face has just thought of everything. The BB Cinch 30 mm BB92 is a great addition to any bike!