Kogel Bottom Bracket BSA-24Kogel hybrid bearings use premium grade Silicon Nitride (Si3n4) Bearings and premium hardened steel bearing races which are mirror polished to perfection. The result? A long lasting, smooth bearing which provides less resistance and is less prone to failures. These bearings are rated to the Grade 3 ABEC 5 level built to spin with minimal friction. This bottom bracket will fit a Shimano crank on a standard English (BSA) threaded frame. No adapters,
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