Park Tool FR-5.2GT Cassette Lockring Tool with 12mm Guide Pin

The Park Tool FR-5.2GT Cassette Lockring Tool with 12mm Guide Pin is the workshop standard for removing and installing cassette lockrings across the full range of modern drivetrains. The integrated 12mm guide pin keeps the tool seated squarely in thru-axle hubs — no slipping, no stripped splines. It fits the 12-spline lockring interface found on 7- through 12-speed cassettes, as well as disc brake lockrings and lockring adapters with the same internal spline count.

The thin-wall construction means you can work without pulling cones or locknuts off the axle first — a genuine time-saver on wheel builds and routine cassette swaps. The 1-inch hex base works with a socket, a box wrench, or a bench vise, so it slots into whatever your workshop setup already uses.

Park Tool FR-5.2GT Cassette Lockring Tool Specs at a Glance

• Fits 12-spline cassette lockrings — 7- through 12-speed compatible
• 12mm guide pin for stable engagement on thru-axle hubs
• Compatible with disc brake lockrings and 12-spline lockring adapters
• Thin-wall design — no cone or locknut removal required
• 1-inch hex base — works with socket, wrench, or bench vise