The Zipp 61903 Ceramic Bearing Kit uses premium materials and precision engineering to gain speed. The bearing rings use a hardened chromium-molybdenum-nickel alloy, the highest quality stainless steel available.
Features:
– Compatible with front hubs for rim brakes: Cognition, with freewheel bodies 176/177/ZM1/ZM2/Cognition
– Includes: 2 ceramic bearings
– Weight: 50g






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