Hxr components easyshift rear hub sram xdhxrs easyshift front hub is a unique 2 in 1 hub that will allow you to convert a fixed gear rig into a modern transmission with an integrated freewheel strong light and durable this innovative hub design will evolve your bike without the need to change large swathes of hardware at a huge expense featuresmaterial 7075 t6 aluminium32h135x9mm135x12mm142x12mmweight 280gbuyhxr componentsfrom chain reaction cycles the worlds largest online bike