Park Tool FR-4 Freewheel Remover - Atom, etc WORKSHOP The Quad Lock Flat Bar

The Quad Lock Flat Bar Adaptor allows cyclists with flat handlebars or square stems to use the Quad Lock Stem Mount

fully internal cable routing and a lightweight high-modulus carbon construction

making setup quicker and more straightforward

Our high performance option for demanding applications

Park Tool FR-4 Freewheel Remover - Atom, etc WORKSHOP The Quad Lock Flat BarThe 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 1" hexagonal base compatible with a 1" socket or wrench Mfr Claimed