Now at a 4

Hydraulic disc brakes

You can just rotate and keep on grinding

and to avoid unnecessary upcharges from frivolous CNC machining

and we love it

Fly Magneto Female Rear Cassette Hub - LHD Size:CrMo Axle/9t/LHD Now at a 4Fly's Magneto Cassette hub features a magnetic system engage using the force of two magnets that allows the ratchet ring to engage. The magnetic field provides an even repelling force which makes the ratchet to work completely straight and are created in a way that reduces friction compared to the use of springs. Neomidium magnets maintain the magnetic field pretty much forever, as well. These properties creates the fastest, most reliable and durable