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ensuring that you can accurately check the adjustments on your bike
as it has become Castelli's best-selling product ever
the B16 is designed to withstand wear and tear from rigorous use
balanced geometry
Blackbearing B4 30.15x39x6.5mm 45/45° Headset Bearing light_front ensuring that you can accuratelyDesigned 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