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I don't have one to examine. How exactly does a crankset removal work?

one such as this.

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2 Answers 2

up vote 4 down vote accepted

The crank removal tool has two threaded pieces. The larger threads into the crank (after you've removed the crank-bolt with a wrench). Tighten it all the way down, as these threads will take all of the force that is required to remove the crank. The smaller threaded piece screws into the larger. It has a flat end on it which goes into the crank. Turn this until this flat end makes contact with the end of the bottom bracket spline (the bit that you removed the crank-bolt from). Then keep tightening it. The flat end will push on the spline and pull the crank off--remember that this piece is threaded to another piece that is threaded to the crank itself.

It's an excellent example of a simple machine--the jackscrew. I'm sure that Sheldon Brown has a great description with photos, line drawings, etc... @gcb provides the link.

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Here I am going along answering questions without noticing that the questioner and answerer are the same. –  DC_CARR Jul 7 '11 at 19:23
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answering my own question :(

http://www.sheldonbrown.com/tooltips/cotterless.html

as usual sheldon brown beat the internet to it.

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It is in fact very clever, a "muscle" tool, but mind you that in some cases you can have trouble if the crank is too tight, at the link you provided there are some solutions, but I have recently had two cases where the crank thread was damaged and I had to resort to a hammer to get it out. –  jackJoe Jun 11 '11 at 8:40
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It would be handy if you could accept your answer, that way it doesn't show on the list of unanswered questions (and your accept rate is 100% instead of 0%) –  Мסž Jun 15 '11 at 1:47
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