The Zipp Cognition NSW Freehub Kit is the ultimate in Zipp hub technology. Every time a conventional hubset starts to coast, friction within the freehub ratchet mechanism works like a drum brake to slow the rider down. The drag between hub shell and driverbody during coasting is considered as efficiency loss, especially for road wheels. High drag also can significantly contribute to chain-dropping issues. The drag torque drives the cassette clockwise so the chain gets loose on the load side.
The solution? The rear Cognition™ hub with AxialClutch™ technology reduces drag by disengaging the ratchet mechanism when coasting. It then uses magnets to re-engaged once the rider starts pedaling.
Includes pre installed bearings and freehub seal.
Open Box - This product has one or more Open-Box units available. These units can be purchased at a discount (see option select). Open-Box units are brand-new and contain all standard parts and accessories. The full manufacturer warranty applies.
B-Stock - This product has one or more B-Stock units available. These units can be purchased at a discount (see option select). B-Stock units were returned from other customers and may have missing or damaged packaging materials. These units are otherwise as new. The full manufacturer warranty applies. Click Here for more information.
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3 of 3 customers found this review helpful.
Easy to replace
My 303 NSW wheel set was for Campy and I needed SRAMShimano. I bought the Zipp freehub kit, but dont forget to get the SRAMShimano axle end cap, too. I would have given it 5 stars if BTD.com would have told me I needed it.
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