14 Speed Internal gear hub.Hollow Quick release or solid type axles.32H or 36H.135mm spaced. Boxed kit includes hub cables & O.E.M or OEM2 Axle plate.Special 4 bolt Disc fitting.526% range of gears (equivalent to typical 27 Speed MTB derailleur system)14 Individual gears (no wasted overlaps or duplicates)Evenly spaced 13.6% gear increments. (no sudden big jumps)Ability to shift whilst stationary or under load.Super efficient sealed Oil bath mechanism (95-99%)Adjustment and maintenance free over thousands of miles.Gear positions are indexed inside hub