Bicycles Stack Exchange is a question and answer site for people who build and repair bicycles, people who train cycling, or commute on bicycles. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

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

one such as this.

share|improve this question
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.

share|improve this answer
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

answering my own question :(

as usual sheldon brown beat the internet to it.

share|improve this answer
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

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.