Pick an axle...any axle... Rear axles for rear hubs from 135 x 9mm QR to 150 thru axles. "Basically, for disc hubs we make a single speed, 135 QR, 135 Thru, 142 Thru and 150 Thru. The 135's and 142 are all interchangeable with a quick one bolt axle swap." -Dylan VanWeelden PR point man for King Cycles.