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Engineered for Optimum Performance: Precision-engineered bearings in the Praxis - B5 Bottom Bracket minimize friction
Precision Fit for FC-7900 Cranksets: Tailored for the Shimano Dura-Ace FC-7900 crankset
as it has become Castelli's best-selling product ever
- Avoid using washing powder
accommodating rear wheel lengths from 130mm to 148mm boost
Blackbearing B4 30.15x39x6.5mm 45/45° Headset Bearing light_front Engineered for Optimum Performance: Precision-engineeredDesigned with angular contact bearings, the B4 efficiently handles both radial and axial loads, enhancing stability and balance. This advanced design ensures smooth and steady steering, making it perfect for sharp turns and uneven paths. Built to Last with Chrome Steel: The B4 uses SAE52100 Chrome Steel balls and rings, ensuring exceptional durability and resistance to wear. This robust construction provides long lasting performance, allowing you to