PARK TOOL CASSETTE LOCKRING TOOL FR-5.2

The Park Tool FR-5.2 is the cassette lockring tool that sees more bench time than almost anything else in a workshop: it fits the 12-spline profile found on the vast majority of 7 to 12-speed cassette lockrings. With the Park Tool FR-5.2 cassette lockring tool, swapping sprockets, changing gearing or deep-cleaning the drivetrain becomes a job of just a few minutes.

The body is made from heat-treated alloy tool steel, so the splines stay crisp even after thousands of tightening cycles. The thin-wall design lets you work without removing cones and locknuts on traditional hubs, while the 12 mm centre bore clears the axle. The 1-inch hex base accepts an open-end wrench or a socket, so all the torque goes into the lockring without slipping and damaging splines or knuckles.

How to use the Park Tool FR-5.2 cassette lockring tool

• Remove the wheel and take out the quick release or axle to free the lockring.
• Seat the FR-5.2 fully into the splines, square to the hub.
• Hold the sprockets with a chain whip and turn anticlockwise with a 1-inch wrench.
• When refitting, lightly grease the thread and tighten to the cassette maker's torque spec.

Why choose the Park Tool FR-5.2

• One tool for Shimano, SRAM (including 1x), SunRace, SunTour, Chris King cassettes and many more.
• Also works on disc brake lockrings and adapters with 12 internal splines.
• Compatible with the top caps of several RockShox forks, handy during suspension service.
• Heat-treated steel built for daily use at the workbench.

From the pro workshop to the home garage, the Park Tool FR-5.2 cassette lockring tool is one of those essential tools that pays off every time you change a cassette or a brake rotor.