On this page there are two pullers (one for lefts and one for right arms) made by CalVan, specifically for stripped out crank arms:ives said:Does anyone know of a way of getting a crank arm off the square taper of the bottom bracket if the dustcap threads have been stripped?
http://www.parktool.com/repair/readhowto.asp?id=136ives said:Does anyone know of a way of getting a crank arm off the square taper of the bottom bracket if the dustcap threads have been stripped?
1id10t said:I had this problem a few months ago with one of my bikes. If you want to keep the cranks then go with what the other posters said. If you're replacing the cranks and don't care what happens to them then I suggest cutting them off or pulling them off. If it's the non drive side you can get a crank puller from an auto store which has either two or three arms which fit around the crank with a large screw on bolt down the middle. Turn the bolt and the arms will lift and eventually pull the crank off (kind of like how a corkscrew works; sort of). If it's the drive side you will have to hacksaw your way through the crank arm. Aim to get the blade down one of the four sides of the BB spindle (not straight down the middle). Saw down beside the spindle. I managed to hacksaw about an inch down beside the spindle before getting a chsiel and rubber mallet. A couple of whacks and the crank split in half. Pulled it away and installed the new cranks. A little frustrating but it can be done. Good luck.
Yes, this will definitely work, but .... The really important thing to mention is that as soon as you feel even the slightest loosening in the crank you need to cease pedalling. Otherwise, you run the risk of permenantly damaging the flats on the crank arm, thereby rendering it junk.meehs said:Might be too late if you already brought the bike to the shop. But anyway sometimes if you just remove the crank bolt and ride (don't go too far from home obviously) the crank will work itself off quite quickly.
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