FR-1.3 Fits 12-spline tool fittings with an approximate outer diameter of 22.6 mm Center bore for axle clearance is 15 mm NOTE: For Falcon® freewheels, use the FR-7. FR-2 Fits 2-notch tool fittings with an approximate outer diameter of 25 mm Fits older SunTour® two-notch freewheels Center bore for axle clearance is 10 mm NOTE: SunTour® four notch freewheels do not accept the FR-2 remover. Use the FR-3 for SunTour® freewheels with four notches. FR-3 Fits 4-notch tool fittings with an approximate outer diameter of 24 mm Fits all Suntour® four-notch freewheels since 1986 Center bore for axle clearance is 10 mm NOTE: The Suntour® two notch freewheels do not accept the FR-3 remover. Use the FR-2 for the Suntour® freewheels with two notches FR-4 Fits 20-spline tool fittings with an approximate outer diameter of 21.6 mm Fits Atom®, Regina®, splined Zeus®, and some Schwinn®-approved freewheels BBT-5/FR-11 Fits 12 spline/approx. 22.8 mm OD tool fittings Fits all Campagnolo® cassette lockrings Also fits Campagnolo® cartridge bottom brackets including Chorus® and Centaur® Base size for socket or wrench is 1" (25.4 mm) NOTE: The BBT-5/FR-11 is not interchangeable with the FR-1.3, FR-5.2, or FR-7. Each tool fitting has its own unique tool profile. FR-6 Fits four-notch tool fittings with an approximate inner diameter of 32 mm and approximate outer diameter of 40 mm Removes four-notch BMX / single-speed freewheels on hubs with 1.37 x 24 TPI threads Center bore for axle clearance is 16mm FR-7 Fits 12-spline/23 mm OD tool fittings Center bore for axle clearance is 10 mm NOTE: The shape of the FR-7 looks similar to the FR-1.3 (for Shimano®, Sun Race®, Sachs® and similar freewheels). The FR-7, however, is made with a slightly larger outside diameter (23mm) to fit the Falcon® Freewheel. To make it easy to distinguish between the two removers, the FR-7 has a silver-colored plating. The slightly smaller diameter FR-1.3 is black. FR-8 Fits four-notch tool fittings with an approximate inner diameter of 25 mm and approximate outer diameter of 32 mm Fits freewheels on flip-flop BMX hubs with M30 x 1 threads Center bore for axle clearance is 10 mm