Park Tool’s FR-5H Cassette Lockring Tool with Handle is a fast and convenient tool for removal and installation of 12-spline Shimano® or SRAM® style cassette lockrings, as well as similar lockrings on rotor discs. The FR-5H features a modified FR-5 tool that allows use without removing most quick release skewer nuts. The removable, threaded steel handle makes it possible to replace a worn or damaged head. This cassette lockring tool is compatible with Shimano®, SRAM® (including 1x), SunRace®, SunTour®, Chris King® and other cassette lockrings, as well as some Shimano® disc brake lockrings.
A newer version of this product is available.
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This made changing the cassette really easy.
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Q & A with home mechanic Tommy Tuite.