Tech & Cleaning

All ACS freewheels feature chromoly sprockets with 4 pawls (2 pairs engaging alternately), for quick engagement. ACS 16T - 22T freewheels thread on Standard English hub threads, and remove with the ACS universal removal tool.

All ACS 14T and 15T freewheels thread onto smaller, metric "BMX Flip-Flop" threads, and are removed with the ACS 14T removal tool.  You may need to remove your hub axle for the tool to have clearance.   ACS hubs have a slide-off shoulder to give the tool necessary clearance.

Left-hand-drive freewheels require left-hand threads, for both standard and small sizes.

To clean, remove freewheel and soak in solvent or Simple Green overnight.  Blow out with compressed air or WD-40 in the gap above the logo stamp.  Drip petroleum chain lube or oil and spin until lubed.