Splined side of Park Tool FR-4 Freewheel Remover, click to enlarge
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Item # FR-4

/ Tools / Cassette & Freewheel

Freewheel Remover — Atom®, etc.

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.

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FR-4 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