Help - Crank arms are stuck due to stripped threads

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  • Trying to remove the cranks&bb on an old frame, but the threads on the crank arms are fucked so can't use the conventional crank remover tool.

    What else could I try? The cranks&bb will be going straight in the bind so don't mind if I have to damage them. Managed the same thing last year with a spade and a hammer, but just though I'd see if there was a more civilized way of doing things first..

  • Angle-grinder and a lung full of aluminium dust? That's how I've done it and I'm civilised. Hell, I'm so civilised I'm actually domesticated.

  • Screw the crank bolt in to the axle (a later allen key type preferably, without the dust cover)
    Use a hammer to gently tap the cranks so that you fold over the alloy where the threads were, till the bolt is trapped under the burred over metal. Undo the bolt and the crank will come off.

  • I'm sure there's a thread on this somewhere.

    Do you want to use the crank after you've removed it? If not then with the bold out of the crank ride the bike a bit up and down your road. It should come loose, you'll feel when it is.

    If you want to keep them there's a few different ways. Ball joint splitter, bearing puller or a recent one was engineers wedges. A car garage will be likely to have the first two.

  • he said....

    The cranks&bb will be going straight in the bind so don't mind if I have to damage them.

    which is why I suggested the hammer method. Everyone has a hammer don't they?

  • I have an amazingly poor memory

    Easier to ride it 50m with the bolt out. But yes, everyone has a hammer. If they don't, why not?

  • Cheers for the suggestions!
    Tried to ride them loose, but they've been wedged in since '82 and they weren't budging.

    Ended up losing patience so reached for a wedge and a hammer. Worked a treat. Will certainly try the methods above in future though (minus the lung full of metal filings maybe..)

  • I've used the car jack method with great success.

  • I sawed mine off with a Dremel.

  • applying gentle heat from a chefs blow torch always helps

  • smash it off

  • smash it off

    Crank arms or your sex life?

  • Crank arms not wank arms.

  • I bought a ball joint splitter but at the Abraham moment, aborted. Hitting my bike with a hammer just seems wrong. I'll opt for metal lungs instead.

  • Have you tried using a crank extractor?

  • Have you tried using a crank extractor?

    Threads are stripped

  • Ok, I know that's what the thread is about but I didn't know if that was what happened to the asker of the latest question.

  • Since you're not looking to preserve the cranks or BB, is there enough of the axle visible that you could take an angle grinder to it?

  • take the bolt out,get 2 hammers.hold one hammer on underside of crank arm/bottom bracket and then hit the top side with hammer number 2 and it will pop off may require several hits

  • I tried it with a dremmel and handsaw, took over an hour

    with a blow torch and hammer it took 3mins

  • Bolts out and ride. Simples.

  • There's some kind of bearing puller, I gather, will fix this. Possibly a motor rather than cycle tool.

  • It may be entirely possible to get 5 arm bearing pullers which will interface with bicycle cranks nicely but all mine are either 2 or 3 arm and as such end up going off squint and such like.

    Bolts out and ride is much easier.

  • I beat mine off with a hammer, fucked the cranks but everything else was ok, AFAIC once stripped cranks are headed for the bin, may as well go in style.

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Help - Crank arms are stuck due to stripped threads

Posted by Avatar for Corbey @Corbey

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