Description
The ACS Main Drive Freewheel is a straightforward, reliable replacement for BMX, single speed, and fixed-gear setups. It threads onto standard 1.375″-24tpi hubs and uses a dual-pawl engagement system that clicks in every 18 degrees — consistent and predictable for everyday riding. The 4-notch removal interface works with ACS and most universal freewheel tools, so swaps are simple.
Available in 16t and 17t, the Main Drive runs a 1/2″ x 1/8″ sprocket pitch — pair it with a 1/8″ single speed chain. Not compatible with 3/32″ chains, motor conversions, or high-torque jackshaft applications.
- Sizes: 16t, 17t
- Finish: Silver
- Threading: 1.375″-24tpi
- Chain compatibility: 1/2″ x 1/8″ only
- Engagement: Dual-pawl, every 18 degrees
- Removal: 4-notch universal tool interface
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