ACS threaded freewheels that are focused on durability for metric thread applications.
Cold forged for high-torque strength 30 steps / 12 degrees of engagement Nickel plated sprocket ring, fits 1/8 and 3/32 chains Fits metric M30x1mm BMX hub threads (the smaller side of a flip-flop hub) Not Included: Removable with Crossfire 6-spline tool M30 = Metric thread, small 6-spline tool (Crossfire)