Unior Shimano / SRAM Cassette Lockring Tool — 1670.5/4
This is Unior’s basic cassette lockring tool for Shimano and SRAM-style cassettes.
It’s a simple shop staple used with a chain whip and 1/2" ratchet to remove and install standard HG cassette lockrings.
Key Functional Details
- Fits Shimano and SRAM HG-style cassette lockrings
- Designed for use with 1/2" drive ratchet or adjustable wrench
- Precision-machined splines for secure engagement
- Steel construction for durability
- Model: 1670.5/4
Compatibility & Technical Notes
- Compatible with Shimano and SRAM HG cassette lockrings
- Works with most road and MTB cassettes using HG interface
- Requires chain whip (or equivalent) for cassette removal
- NOT compatible with SRAM XD/XDR driver lockrings
- NOT compatible with Campagnolo cassettes
- NOT for Centerlock rotors
- Manual hand tool — not designed for impact drivers
Service / Ownership Context
This is a basic cassette service tool for drivetrain maintenance. Proper engagement helps prevent rounding aluminum lockrings during removal.
Fit & Use Signals
- Good Fit: Home mechanics and shops servicing Shimano or SRAM HG cassettes.
- Not A Fit: Campagnolo drivetrains, SRAM XD/XDR systems, or riders looking for a trailside tool.
This is your standard HG cassette tool. Nothing fancy, but it works.
Biggest mistake: customers forget they also need a chain whip. This tool alone won’t remove a cassette.
Second mistake: trying to use this on XD/XDR or Campy. Won’t fit.
Always fully seat the tool before applying torque. Half engagement rounds lockrings fast.
Most seized lockrings come from dry installs or over-torque. A little grease on reinstall saves headaches later.
Failure points are user error: slipping adjustable wrenches, shallow engagement, or trying to impact it.
Who this is really for: anyone doing cassette swaps at home or in the shop.
Who should avoid: riders on SRAM XD/XDR or Campagnolo systems.
Mechanic advice: hold cassette with proper chain whip, break lockring loose cleanly, and torque to spec on reinstall. Grease threads lightly.