The 1670.5/4 is the basic Shimano/SRAM cassette lockring tool: the 12-spline socket that engages every HG-pattern cassette lockring in current production, sized to a 21 mm wrench flat and a 1/2" ratchet socket on the back end. It's the bench version of the cassette-removal tool, the one that lives in the same drawer as your ratchet and breaker bar. The HG (Hyperglide) lockring pattern is the dominant freehub-mount standard. Shimano and SRAM share it across 7- through 12-speed road and MTB cassettes, including SRAM XD and XDR cassettes for 11- and 12-speed (the XD body uses an HG-pattern lockring even though the cassette interface is different). The 1670.5/4 fits any of them. The Campagnolo splined pattern is different and needs the 1670.4/4 instead. How to use it Seat the splined end into the lockring, register the 21 mm wrench flat or the 1/2" drive against your tool of choice, hold the cassette still with a chain whip or cassette wrench on one of the larger cogs, and turn the lockring counter-clockwise. Cassette lockrings are torqued to 40 Nm new from both Shimano and SRAM; expect a firm break-free on the first turn even if the wheel has only been ridden a season. If the lockring tool wants to skip out of the splines under load, that's the case for the cassette lockring tool with guide pin 1670.7/4 or the integrated handle version 1670.8/2BI-US instead. The 1670.5/4 is the right pick when you're already set up with a ratchet and you want the smallest, simplest tool on the bench that gets the job done. Compatibility Shimano HG cassettes, 7- through 12-speed SRAM HG cassettes (XD and XDR included; the lockring pattern matches) Sun Tour, Chris King, Microshift and Sunrace cassettes using the Shimano HG lockring pattern Not for Campagnolo (use 1670.4/4) or freewheels (use the 1670 freewheel-remover series) Specs 12-spline Shimano/SRAM HG lockring pattern 21 mm hex wrench flat for an adjustable wrench or torque wrench 1/2" square drive socket on the opposite face for a 1/2" ratchet or breaker bar Forged steel, black finish; 45.4 mm overall length, 66 g Article number: 1670.5/4 Built in Zreče, Slovenia Unior has been forging hand tools in Zreče since 1919, and sponsors professional road and mountain-bike race teams. The 1670.5/4 is the unadorned version of a tool the same metalwork makes in two other formats; guide-pin (1670.7/4) and integrated-handle (1670.8/2BI-US). All three start from the same splined socket; the choice is about how much help you need on the way to the lockring. Pro tip from our mechanics The 1670.5/4 is the right tool for a clean cassette swap, but the 21 mm wrench flat is the trap. A 21 mm wrench is wide enough that you can run out of swing room behind the dropout on some thru-axle frames before the lockring breaks free. A 1/2" ratchet stack with a short extension gives you the swing arc back without losing engagement. The cassette-replacement workflow has more on which Unior lockring variant fits which hub: When and how to replace your cassette → FAQ Can I remove a Shimano cassette without a lockring tool? Plan on using one. The lockring is splined and leaves the factory torqued to 40 Nm on both Shimano and SRAM, so breaking it free takes a socket that fills those splines, plus a chain whip or cassette wrench to keep the cassette from spinning. Does the 1670.5/4 fit SRAM XD and XDR cassettes? Yes. XD and XDR bodies carry the same HG-pattern lockring even though their cassette-mounting interface differs, so this tool engages them just as it does a Shimano lockring. The exception in the family is Campagnolo, whose spline pattern needs the 1670.4/4 instead. What size wrench or ratchet drives the 1670.5/4? Either a 21 mm wrench on the hex flat or a 1/2-inch ratchet or breaker bar in the square drive on the opposite face. On some thru-axle frames a 21 mm wrench runs short of swing room at the dropout before the lockring lets go; a 1/2-inch ratchet with a short extension gives the arc back.
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