This is a WRP Center Hub - New - Unmounted -in packaging - includes adapters to mount with SRAM 3 bolt cranks or RaceFace Cinch and 0/3/6mm offset spacers -Change gears whenever you want? Help isolate suspension forces from your pedals? Adaptable to almost any direct mount crankset? Instant engagement, silent and near zero rolling resistance? Sounds great, hey? -Sprag clutch front freewheel - total customization to suit discipline, component brand and to swap between bikes. -Independent Spider for chainline offset adjustment to suit most chainlines (Standard, BOOST, DH, Road, Gravel, etc). -The CentreHub can act like a slipper clutch on F1/MotoGP. -Can result in less snapped chains due to not having to shift under load and less chain slap due to a constantly tensioned chain. Less “break-away” friction when transitioning from coasting to pedaling. -More stability due to gyroscopic effect of the rotating drivetrain. -Black Oxide one-way bearing - sealed for life. -309 grams Retail is $800 U.S - Selling for $400 shipped in US, https://www.youtube.com/watch?v=gdRZqr2FcF8 https://www.williamsracingproducts.com/shop/p/centrehub-pre-order