The Abbey Crombie tool is one of the best cassette tools made. It’s what I personally reach for almost every time I’m installing or removing a cassette. But what about those times when that lockring is really tight. Like, gorilla-hanging-off-the-end-of-a-cheater-bar tight? For those instances, you might need a little more leverage. Fortunately, there’s the Socket Crombie tool.

Abbey Bike Tools Socket Crombie

Essentially the end of a Crombie tool turned into a 3/8″ drive socket, the Socket Crombie has been available for S Group cassettes (SRAM, Shimano, etc.) for some time. Now, there’s a new version for Campagnolo cassettes as well.

Abbey Bike Tools Socket Crombie opening

Like the original Crombie tool, the Socket Crombie has a wide opening that allows it to slip over the quick release skewer without removing it from the hub. Of course, it works on thru axle wheels as well.

Abbey Bike Tools Socket Crombie on torque wrench
All images c. Abbey Bike Tools

In addition to allowing you to use a large breaker bar to remove stubborn lockrings, the socket also allows it to be used on torque wrenches. This is handy for the S Group model as companies like SRAM start to use the lockring spline for suspension top caps.

Available for S Group or Campagnolo lockrings, the Socket Crombie retails for $50.


      • Why? I primarily work on cars which are all metric still, a 1” socket in 1/2” drive is like $3.99. The 27mm impact that’s included in most 1/2” sets will usually work perfectly fine. Breakaway torque is probably only around 50/60ft lbs even on really stuck ones.

  1. Not sure why I’d pay this much over the park and a 1” socket. This doesn’t appear to even be an impact rated socket. Whenever I’ve had a really stuck on lock ring I don’t even need my 1/2” drive impact, my little dewalt 200 foot pounder gets it loose in a second.

    • Crash – let me show you my Park Tool graveyard someday. I think you’d really enjoy the handful of shattered lock ring/bb bits I have on full display so everyone can see true Park quality. I also have the typical 4,5,6mm prematurely rounded off allen keys that don’t spin bolts anymore, people think they’re a joke. Ha-ha, right? Of all the great tools out there I never understood the desire for cheap junk. #neverpark

      • Okay so then what about Unior? Roughly Same design impact rated, 1/2” drive in the back instead of 3/8”, however that’s probably a bonus $13.

        • Exactly. I replaced the majority of my Park tools with Unior over the years. The big difference is material. Unior’s chrome vanadium steel is infinitely better than Park’s low grade carbon steel. I’m not really one to split hairs over price of decent tools. You get what you pay for.

  2. I mean, the back of the thing in this article is 3/8″, so you’re already into the imperial tools bucket. It’d be way way cheaper to just buy a 1″ socket for each ext spline tool and use two dabs of RTV to attach it. Splines on one end, 3/8″ drive on the other.

  3. if you work in a bike shop, there are NO non-metric tools in your shop, except to maintain your Park tools. And that is incredibly stupid on Park’s part.

  4. this is a much more useful tool than “campy cassette lockring”.
    The majority of Shimano freewheels use the same pattern as do a bulk of Campy square taper bottom brackets.

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