Our 4-prong BMX/single-speed freewheel remover has 24mm wrench flats and we recommend securing the tool to the freewheel with an axle nut or quick release skewer.

The distance between the four prongs is 35mm on the inside, 40.9mm on the outside. Prong height is 5mm, width is 7.8mm. Overall height of the tool is 25.4mm.