hey i been trying to take off my crank on my bike but ?

Q: when i try i can't i take it off see i take the bolts that hold the crank arms on but the arms won't come off why the lock ring and bearing race cup dose but the crank arms won't

A: You need a crank puller. Pick one up at the local bike shop. Here is how you use it. http://www.parktool.com/repair/readhowto.asp?id=103 http://bicycletutor.com/replace-cotterless-cranks/

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