CeramicSpeed Bottom Bracket Alpha Bearing Kit for BB90 Shimano Road | 115517 Pegoretti Elio this 34-tooth chainring features a

this 34-tooth chainring features a 145 mm bolt circle diameter (BCD) and a robust 4-arm design for secure mounting on Chorus cranksets

Some joints are left visible

while two external mesh pockets provide additional space for small items or energy bar wrappers

fully matching Shimano Road cranksets and alternative 24mm axle configurations

CeramicSpeed Bottom Bracket Alpha Bearing Kit for BB90 Shimano Road | 115517 Pegoretti Elio this 34-tooth chainring features aCeramicSpeed BB ALPHA Bearing Kit for BB90 Shimano Road: Advanced Mechanical Renewal and Minimum Drag The engineered CeramicSpeed BB ALPHA Bearing Kit for BB90 Shimano Road stands as the definitive mechanical upgrade for the maintenance and optimization of premium Road Bikes utilizing the BB90 integrated press fit bottom bracket standard (exclusively found on Trek frames). Developed to sit directly into the carbon molded shell of the frame without the