About Park Tool Freewheel Remover (FR-4)
The FR-4 is designed to fit the 20-spline tool fittings found on older SunTour freewheels. Constructed from heat treated alloy tool steel, the FR-4 features a 1″ tool fitting for use with an adjustable wrench, socket, or bench vise.

Features
Fits 20-spline tool fittings with an approximate outer diameter of 21.6 mm

Fits Atom, Regina, splined Zeus, and some Schwinn-approved freewheels

About Park Tool
Park Tool are the world’s largest bicycle tool manufacturer. Located in St. Paul Minnesota they have been designing and manufacturing bicycle specific tools since 1963. Their dedication to quality and innovation have gained them the reputation for producing the best bicycle tools in the world.