Disc brake rotor lockring wrench

A dedicated Center Lock rotor lockring wrench; 12-point ring spanner geometry on a single-ended fixed wrench with an ergonomic red handle. Drives the splined lockring that holds Center Lock rotors onto the hub's splined interface, the dominant rotor mount on modern Shimano and SRAM road and gravel hubs.

Center Lock replaced the 6-bolt rotor mount on most current Shimano hubs and on a growing share of SRAM and third-party hubs because the splined lockring is faster to install and remove than six T25 bolts. The trade-off is the dedicated tool: a Center Lock lockring needs its own splined wrench. The 1670.5 line covers the work, and this fixed-handle variant is the simplest format; one wrench, one motion, no socket-to-ratchet conversion.

Where the fixed-handle wrench fits

A socket-style lockring tool (in the cassette-lockring family) drives the same splined lockring via a ratchet handle, which gives more leverage but adds a tool-change step. The fixed-handle wrench skips the conversion: handle, head, rotor lockring, one engagement. For shops that swap rotors regularly; wheel transfers, brake-pad service that requires rotor removal, customer wheel builds; the fixed handle is the faster everyday tool.

The 12-point ring spanner geometry means the wrench can engage the lockring at any of 12 positions around the rotation, which matters in tight clearances where a hex profile would only fit at six positions.

Compatibility

• Shimano Center Lock rotor lockrings
• SRAM Center Lock rotor lockrings
• Any third-party hub running the standard Shimano Center Lock splined-lockring pattern
• Through-axle and quick-release hubs both accommodate the wrench

Specs

• Drive: 12-point ring spanner, Center Lock splined-lockring pattern
• Format: single-ended fixed wrench with ergonomic handle
• Handle: red ergonomic grip
• Material: forged steel
• SKU: 629613

Built in Zreče, Slovenia

Unior has been forging hand tools in Zreče since 1919, and is the official technical partner of multiple World Tour and downhill teams. The Center Lock workflow is the same workflow Unior's team-supported mechanics use at races where rotor swaps happen between sessions; the fixed-handle wrench is the bench tool that supports the same procedure at the home or shop level.

Pro tip from our mechanics

Don't loosen a Center Lock rotor lockring with the rotor under load (e.g., with the wheel still in the frame and the brake pads in contact). The lockring is tightened to a value that takes the full ring-spanner leverage; trying to break it loose against pad drag puts unnecessary force on the wrench and risks rounding the lockring splines. Remove the wheel, lay it flat, and break the lockring loose with the rotor unrestrained.

For the broader picture on rotor service, including alignment and when a lockring swap helps with brake rub: Fix disc brake rub →.