Converts 240/350/440 series Shimano compatible ratchet hubs from 135mm to 142mm Converts 240/350/440 series Shimano compatible ratchet hubs from 135mm to 142mm Compatible with XRC/XMC1200, XR/XM/EX1501, X/M1700, E1700, FR1950, 350 Big Ride 12/190 to 12/197 and BR2250 12/150 to 12/157 Shimano Ratchet system only