TOKEN has revolutionized industry preconceptions about how carbon composites, titanium, ceramic, and alloy materials can be applied to high performance cycling components. CNC alloy track sprocket lockring.
While trying to tighten it up tight enough so the cog couldn't slip the lock ring broke! When riding fixed things need to be tight to be safe and this didn't make it to an acceptable tightness before it broke. Would not recommend this as it doesn't allow you to ensure that the cog wont slip while braking on a fixed gear bike!
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Basically, alloy lockrings are a complete nightmare - when doing them up tight enough to feel safe running brakeless, every lockring tool I have ever used in any Evans workshop (notably well equipped) has slipped by chipping the corners off the notches. This eventually results in the need to use a vice to remove it, which usually damaged the hub. A steel/cro-mo lockring is a must.