Park Tool Cassette Lockring Tool - FR-5.2

The Park Tool Cassette Lockring Tool FR-5.2 is built around a single, unglamorous job — and it does it without compromise. Heat-treated steel alloy construction means the tool handles the torque required to break loose stubborn lockrings without rounding out or flexing under load. Thin-walled design lets you work without pulling cones and locknuts first, which matters when you're mid-service and don't want to rebuild a hub to change a cassette.

Compatibility is broad. The FR-5.2 works with 7- through 12-speed cassettes using the standard spline interface, and the 12 internal splines also fit disc brake lockrings and adaptors — so one tool handles both drivetrain and brake rotor work on compatible wheels. The hexagonal base accepts a wrench, socket, or vise, giving you options depending on whether the wheel is in a stand or you're working with it clamped down.

Park Tool Cassette Lockring Tool Specs at a Glance

• Compatibility: 7- to 12-speed cassettes with standard spline interface
• Also fits: Disc brake lockrings and adaptors with 12 internal splines
• Construction: Heat-treated steel alloy
• Drive interface: Hexagonal base — works with wrench, socket, or vise
• Design: Thin-walled for use without removing cones and locknuts