This bottom bracket is suitable when you have a frame with a PF30, BBright or 386EVO box and want to install BB30 cranks in the frame. They all have a 46mm inner diameter and a smooth interior, although widths range from 68mm to 86mm. The crank has a 30mm diameter pivot. Thanks to the bearings, this center console suffers virtually no power loss due to friction. The bearings have super-round, super-smooth CeramicSpeed balls that roll on hardened steel raceways. The Coated version has a metal coating applied to the raceways, making them even harder and smoother, resulting in longer life and les...