The long awaited & highly anticipated Seismic hub from Eclat is now available! Eclat have designed a brand new cassette TCS (Toothed Coupling System) mechanism which features 2 couple d toothed ratchet rings which are inside the hub & the driver. The two rings are pushed together with a very special design of spring, which allows the hub to transfer power in one direction, & “freewheel” in the other. Basically a much stronger internal mechanism, which can’t fail even after years of heavy use. No more skipping, slipping or popping, you can really crank this thing as hard you want & it’s not going to fail. Even after years of heavy use, this hub was designed to keep going on & on. 2 x Nylon Eclat Hub guards included. section Product Specs HUB TYPE: Cassette AXLE: 14mm Male DRIVER: 9t SPOKE HOLES: 36h WEIGHT: 467g / 16.45oz