Park Tool's FR-5.2GT Cassette Lockring Tool w/ 12mm Guide Pin is specially designed for removing and installing cassette lockrings from thru axle hubs. The 12mm guide pin helps stabilize the tool while in use. It's compatible with Shimano®, SRAM® (including 1x), SunRace®, SunTour®, Chris King®, and other 12-spline cassette lockrings (23.5mm diameter) as well as some Shimano® and similar disc brake rotor lockrings.
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Used it transfer two brake rotors from one wheelset to another wheelset and to install a new cassette. Very precise fit made for easy work.
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Q & A with home mechanic Tommy Tuite.