MAINDRIVE 17T 1/2" X 1/8" Freewheel

Main Drive "Reliable Replacement" freewheels are similar to Original Equipment on most new BMX, fixie, and other single speed bicycles.  2 pawls engaging simultaneously every 18°, acceptable for most casual cyclists.  Not recommended for motor conversions, jack shafts or high-torque use. MD Freewheels thread onto standard 1.375"-24tpi hub threads (if you currently have a 16T or larger freewheel, it is most likely compatible).  Sprocket pitch is 1/2" x 1/8", compatible with 1/8" wide, single speed chains (3/32" wide chain will not fit). MD Freewheels feature 4-notch removal, compatible with ACS and other Universal removal tools.  Chrome Plated 17T #63630-1000  Made in China