I can't get my lockring tool to fit my cassette's lockring. The tool is about 1mm i diameter bigger than the lockring, although they have "hills and valleys" that line up.

Here's the lockring:

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Here's the lockring tool:

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Here's the tool in the lockring before I try to engage the lockring with the tool:

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And here's the tool nestling on top of the lockring, but it doesn't fit in at all:

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The lockring says "LB SHIMANO" on it. The tool says it's compatible with Shimano Hyperglide. Do I have the wrong tool for the job?

  • 1
    There are about a half-dozen different common cassette lockring standards (and no doubt about 2 dozen more less common ones). Assuming there are no burrs on either the tool or the ring, preventing them from mating, you have the wrong tool. Commented Oct 30, 2016 at 12:23
  • It might be worth measuring the dianeter of the tool you're using (which you know is about 1mm too big). Then Park Tools make a decent selection of lockrings, you may see one that fits. There's a few of them about.
    – PeteH
    Commented Oct 30, 2016 at 15:38
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    First of all: are you sure you need to remove the freewheel (I'm pretty sure that's a freewheel, not a cassette)? I see from your other question that you have a broken axle, I assume it's the same wheel. If you're just trying to fix the axle, you can leave the freewheel alone. Commented Oct 30, 2016 at 15:56
  • When you restrict to Shimano, theres 1 freewheel tool and 1 cassette tool (up to variants that don't matter, e.g. having a guide pin, or coming with a built in handle or whatever). The thing there looks to be a cassette tool with guide pin similar to the Park Tool FR-5G.
    – Batman
    Commented Oct 30, 2016 at 23:46
  • @MikeBaranczak Yes, I've replace my chainwheels and chain, and wanted to replace the cassette sprokets. Well, I've realised this is a freewheel instead, and I'd like to replace it for an optimised drivetrain.
    – eoinoc
    Commented Nov 1, 2016 at 20:15

1 Answer 1


I think thats a Shimano freewheel, rather than a cassette.

A Shimano freewheel needs a tool like a Park Tool FR-1 (or FR-1.2 or FR-1.3), which has 12 splines and a diameter of around 23 mm rather than the Shimano cassette tool (Park Tool FR-5 or its variants), which also has 12 splines but a diameter of around 23.4mm.

See this link from Park Tool on how to remove it.

  • It looks like the cassette needs a tool in the 2 dimples you see there to remove it so that looks, as the others say, like the freewheel you're wanting to undo.
    – Chris
    Commented Oct 30, 2016 at 20:55
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    You don't need to engage the 2 dimples. If you can't get the proper tool, you can take a punch and hit those dimples or use a pin spanner and destroy the freewheel to remove it. Directions are here. The proper freewheel remover will just go into the splines and not touch the dimples.
    – Batman
    Commented Oct 30, 2016 at 21:42
  • I remember probably 20 years ago now having to take cassettes off by tapping that locking round with a hammer and screwdriver. It worked and when you're a kid you don't necessarily have the best tools for the job always.
    – Chris
    Commented Oct 30, 2016 at 21:45
  • Yes, its one way to get it off, but its more work than just getting the proper tool and a crescent wrench (and prevents re-using the freewheel; the one pictured looks to be in pretty decent condition).
    – Batman
    Commented Oct 30, 2016 at 21:49
  • I think you can do it without ruining anything except maybe the lock ring if it's too tight. I agree, get the right tool for the job though.
    – Chris
    Commented Oct 30, 2016 at 21:55

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