Bike Forums - Crank arm puller thread size

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Crank arm puller thread size

As opposed to getting a arm puller cant i just go get a bolt with the same thread size and use that instead. My lbs in closed for 2 weeks and i dont wanna wait for one to get shipped to me

i would reccomend against that. first off, it would be very difficult to find a bolt that is the correct size and with the same thread pitch. furthermore, crankpullers are designed to push against the bottom bracket without harming it. a regular bolt might destroy the bottom bracket spindle.

plus, if you order one, youll have it forever and wont have to go to the lbs every time you need to take your cranks off. having tools saves you money and time. i say buy one

Quote:

Originally Posted by TheMow

As opposed to getting a arm puller cant i just go get a bolt with the same thread size and use that instead. My lbs in closed for 2 weeks and i dont wanna wait for one to get shipped to me

An interesting question. First, you would need to find a bolt that is 22x1mm. That's 22mm diameter with 1mm thread pitch. I'd say the odds of finding one of those are very, very slim, and none - and, assuming you could find one, it would likely be expensive. That's the part that threads into the crank arm as an anchor. Then you would need to cut it to length, drill out the middle and then tap that hole for the bolt that does the actual extraction. The dimensions and threads of that bolt are not really critical as it's just pushing on the spindle end to, in effect, pull off the crank arm.

It would be an interesting project for a student machinist, but pretty much a waste of time and money for anyone else. You can get a great crank extractor, the Park CWP-6 for <$15 here:

http://www.biketoolsetc.com/index.cg...tem_id=PA-CWP6

If you like Pedros tools better, here is their version at $13.99 :

http://www.bikesomewhere.com/bikesom...ge/58/308/7028

If you do just minimal maintenance on a bike you will use one of these tools again and again. They are worth $15 and I seriously doubt there is a cheap DIY solution (but, if anyone has one please let us all know). There are good reasons for some specialty tools and this is clearly one of them.

Go to the next closest bike shop and buy one

yea i went and got one thanks....I got a park. it was $14. Worked great