• I managed this once with gear/bearing puller. Bought a cheap set of three from screwfix... Cheap indeed as it didn't really fit around the 5 arms. After some manouvering and a bleeding lip (don't ask), the cranks came off.

  • I tried a dreaded three-arm gear puller once. Didn't work with that one, unfortunately. The puller broke. Not ideal on a five-arm spider.

    With this current crank I had tried liberal amounts of heat (to make use of aluminium's greater thermal expansion coefficient) and riding a good few km without a crank belt. No loosening joy was had.

    I'm really happy about finding a tool with a centring guide - should be so much easier to cut the new thread properly and save the crank. I'm going to get a handy engineering friend to help.

  • It was a right faff and I would recommend something more robust or with more arms, or having the claws against e.g. a piece of wood and not the crank arms directly. In my case, it was an old Shimano crankset that I was willing to sacrifice, and that's what happened in the end.

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