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-   -   removing cranks: tool to use? (https://www.bikeforums.net/bicycle-mechanics/238107-removing-cranks-tool-use.html)

hackybiker 10-18-06 10:56 AM

removing cranks: tool to use?
 
Can I use a regular socket wrench to remove the crank arms off the bottom bracket? Or do I need a special tool?

This is on an 80s Fuji with a standard square bottom bracket, arms seem to be held by a hex bolt.

thurstonboise 10-18-06 11:00 AM

Use a regular socket to remove the bolt, but you will need a crank puller to remove the cranks from the BB.
They're pressed onto the BB spindle really tight, you need the tool to push the crank off of the spindle.

moxfyre 10-18-06 11:06 AM


Originally Posted by hackybiker
Can I use a regular socket wrench to remove the crank arms off the bottom bracket? Or do I need a special tool?

This is on an 80s Fuji with a standard square bottom bracket, arms seem to be held by a hex bolt.

The hex bolt provides a clamping force to keep the arm tightly pressed onto the square taper BB spindle, but once the hex bolt is removed, the crank arm will still be firmly pressed onto the spindle.

You need a crank extractor tool to remove it: http://www.nashbar.com/profile.cfm?c...racket%2FPedal The crank extractor threads into the large threads that surround the hex bolt, and literally pushes the spindle away from the crank to remove it. Be careful to thread the extractor in straight and all the way. A crank with stripped extractor threads is no fun :(

hackybiker 10-18-06 11:14 AM

Thanks!! I wasn't aware of the extractor part...

reverborama 10-18-06 01:19 PM

And make sure you cross-post some pictures of that Fuji and the process of removing the crank and replacing the BB over on the Classic/Vintage forum!

moxfyre 10-18-06 01:21 PM


Originally Posted by reverborama
And make sure you cross-post some pictures of that Fuji and the process of removing the crank and replacing the BB over on the Classic/Vintage forum!

Photos of the Fuji would be cool, if it's a nice bike, but removing a bottom bracket is not exactly an exotic repair :rolleyes:

operator 10-18-06 01:41 PM

oh snap

hackybiker 10-18-06 02:07 PM

I'm going to take it to the local co-op and ask to use their tools. So I don't think pics of the process will be possible!

The Fuji itself is nothing special, although the fit is great for me. I picked it up for $30 at a thrift store. Some light rust in the scratches and dings that I'll have to sand out and clear paint, but it was pretty much rideable as-is. I've been slowly acquiring cheap parts to make it into what I want. The cost is adding up though!!

Here's a pic:

http://photos1.blogger.com/blogger/5...1600/regis.jpg

Landgolier 10-18-06 02:22 PM

This might be obvious, but ask someone at your co-op to show you how to use the crank puller. Most cranks have about 6 threads, and if you don't get it screwed in all the way you risk just yanking out the threads.

San Rensho 10-18-06 02:30 PM


Originally Posted by hackybiker
I'm going to take it to the local co-op and ask to use their tools. So I don't think pics of the process will be possible!

The Fuji itself is nothing special, although the fit is great for me. I picked it up for $30 at a thrift store. Some light rust in the scratches and dings that I'll have to sand out and clear paint, but it was pretty much rideable as-is. I've been slowly acquiring cheap parts to make it into what I want. The cost is adding up though!!

Here's a pic:

http://photos1.blogger.com/blogger/5...1600/regis.jpg

Couple of things. Its really easy to strip the threads on the crank when you use the extractor tool.

First, make sure after you take out the crank arm bolt be sure to check for a washer and remove it if there is one.

Second, clean the threads on the tool and on the crank arm and oil the threads before installation.

Back the extractor bolt out of the nut that screws into the crank, thread the nut on and crank arm then snug it up with a wrench, don't wank on it, but be sure its tight.

Go easy as you turn the extractor bolt! If you feel a lot of resistance, smack the end of the bolt with a hammer, loosen the extractor bolt, snug up the nut in the crank arm and start over.

simplify 10-18-06 04:26 PM

...and third, the link doesn't work! :(

Nevermind, found it on your blog! That's a sweet bike.

Bikedued 10-18-06 10:58 PM

My crank extractor tool is less than two weeks old, and has been used four times already. A worthwile investment.,,,,BD

urbanknight 10-19-06 12:02 AM

I love how some tools have the most obvious names, like crank puller. Then there's spanner wrenches, etc.

peripatetic 10-19-06 10:54 AM


Originally Posted by Bikedued
My crank extractor tool is less than two weeks old, and has been used four times already. A worthwile investment.,,,,BD


+1. Big thumbs up on my cheapo crank extractor.

hackybiker 10-20-06 12:02 AM

An update: success!

With all the warnings about not stripping the threads, I was extra careful with the crank puller, and got someone to show me how to do one side first, then I did the other myself. Made sure to clean and grease before I put the new cranks on, and it worked great! Thanks everyone.

The new cranks are definitely lighter: aluminum alloy chainrings as well as arms. The old ones had steel chainrings plus a pants guard. I didn't expect the weight difference to be so significant, but I do notice it when I lift up the bike! Amazing.


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