PF30a is a Cannondale-specific standard for their 73mm wide bottom bracket shells. This CeramicSpeed kit is for cranksets with a 30mm axle
CeramicSpeed Bearings come installed in two cups and are connected through the shell via a spacer tube. There are versions with Standard and Coated Bearings. Both have super round CeramicSpeed Balls and hardened-steel races. The CeramicSpeed Coated have an additional attribute: a 3-micron thick metallic layer over the races. This addition makes the races harder and smoother, lowering drag and increasing life.Compatibility matrix
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