Wheels MFG BB30 Outboard ABEC-3 Bottom Bracket for Shimano BF PSI The Ultra 410 features a

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

The signature Feedback Sports Red Anodized Aluminum body is lightweight and strong and can be used just as you would any 2-way ratchet

Materials: Cupro Aluminium

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

They save weight because they don't need the spider and chainring bolts

Wheels MFG BB30 Outboard ABEC-3 Bottom Bracket for Shimano BF PSI The Ultra 410 features aTwo 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: