Dt swiss 240s mtb disc rear hub 6 bolton tarmac or on a bmx track 240s hubs are the benchmark for all high end hubs stainless bearings and the star ratchet freewheel system result in unmatched reliability featureswidth 142mm12mmweight 240gbrake interface is 6 holesholes 32bearings stainless cartridge bearingsconversion kit dt swiss thru bolt thru axle quick releasebuydt swiss wheels tyresfrom chain reaction cycles the worlds largest online bike store