Eclat's long awaited, highly anticipated Seismic Cassette Hub is finally here, utilising a newly designed cassette TCS (Toothed Coupling System) mechanism. This new system features 2 coupled 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. The hub shell is built from 6061-T6 aluminium & paired with a heat-treated hollow chromoly axle for reliability, & it also features sealed bearings & comes with Eclat's Viper nylon-fibreglass hubguards. section Product Specs HUB TYPE: Cassette AXLE: 14mm Male DRIVER: 9t DRIVE SIDE: Right Side Drive SPOKE HOLES: 36h WEIGHT: 467g (1.03lbs)