What Is It?
The Park Tool FR-5.2 Cassette Lockring Tool is a professional-grade tool designed for the installation and removal of cassette lockrings, Centre Lock disc brake lockrings, and certain RockShox suspension fork top caps. Featuring a precision-machined 12-spline interface, it fits the most common cassette lockring standard used by Shimano, SRAM, SunRace, SunTour, Chris King, and many other manufacturers.
Manufactured from heat-treated alloy tool steel, the FR-5.2 is built for long-term workshop use and is compatible with a 1" wrench, 1" socket, or bench vice for maximum versatility.
Key Benefits
-
12-Spline Compatibility: Fits the most common cassette lockrings used on 7–12 speed drivetrains.
-
Multi-Purpose Tool: Compatible with cassette lockrings, Centre Lock disc brake lockrings, and selected RockShox fork top caps.
-
Professional Construction: Heat-treated alloy steel provides exceptional durability and long service life.
-
Thin-Wall Design: Allows use without removing hub cones or locknuts on many wheel systems.
-
Versatile Drive Options: 1" hex base fits a socket, open-end wrench, adjustable wrench, or bench vice.
-
Precision Machined: Ensures accurate engagement to reduce the risk of slipping or damaging lockrings.
-
Workshop Proven: Trusted by professional mechanics and home workshops worldwide.
Specifications
| Specification |
Details |
| Product |
Park Tool FR-5.2 Cassette Lockring Tool |
| Tool Type |
Cassette & Centre Lock Lockring Tool |
| Spline Count |
12 Splines |
| Spline Diameter |
Approximately 23.4 mm |
| Material |
Heat-treated alloy tool steel |
| Drive Interface |
1" Hex Base |
| Centre Bore |
12 mm |
| Compatibility |
Shimano®, SRAM®, SunRace®, SunTour®, Chris King® cassette lockrings, Shimano Centre Lock rotor lockrings, selected RockShox fork top caps |
Who Is This Best Suited For?
The Park Tool FR-5.2 Cassette Lockring Tool is ideal for:
- Professional bicycle mechanics
- Home bike mechanics
- Road cyclists
- Mountain bikers
- Gravel riders
- Commuters
- E-bike owners
- Anyone installing or removing cassette lockrings or Centre Lock brake rotors
Compatibility Note: The FR-5.2 fits 12-spline lockrings with an outside diameter of approximately 23.4 mm. For quick-release hubs requiring extra tool stability, Park Tool also offers the FR-5.2G (5 mm guide pin), while thru-axle hubs are better served by the FR-5.2GT (12 mm guide pin).
