Introducing the Hydra Classic Boost 6B Rear wheel hub, made with precision in Asheville, NC. This lightweight hub is easy to service and features a 690 POE feehub for fast 0.52 degree engagement. Compatible with a 12mm axle and a 148mm hub spacing, it has 32H drilling and a 6-bolt rotor mount. The Shimano HG freehub body and J-bend spoke type give it a sleek look in black. At only 286g, this hub is the perfect addition to your bike's rear wheel."