Wheels MFG BB30 Outboard ABEC-3 Bottom Bracket for Shimano BF PSI The six larger sprockets have

The six larger sprockets have a double frame system for extreme torsional stiffness

The Ultra 410 features a 12mm double-bolting temper hardened steel shackle providing protection against cutting and torsion attacks in a simple design

Black anodized aluminum

a red ring will light up around the button

Bearings: Enduro Angular Contact ABEC-5

Wheels MFG BB30 Outboard ABEC-3 Bottom Bracket for Shimano BF PSI The six larger sprockets haveTwo machined aluminum cups thread together keeping the bottom bracket stable in the frame, increasing bearing life, and simplifying maintenance. This means no more creaking, smoother operation, longer bearing life, and really quick bearing replacement. Specifically designed for installing 24. 00mm spindle diameter cranks (Shimano, Etc.) in BB30 (42mm ID BB shell) frames without the need for any adapters. Specifications Bearings: Enduro ABEC 3 Color: