Originally Posted by
JohnDThompson
Here's a Stronglight crank thread tap:
Bicycle Research made thread chasers for 22mm crank arms:
And there are repair kits that ream and re-tap stripped crank arms to a larger diameter:
Crank thread repair kit VAR Tool, Pro Tap Set Bike
But you're right. Apart from the Bicycle Research thread chasers, none of these are likely to be found in a home mechanic's tool box.
Originally Posted by
jeromeoneil
I'm pulling the bottom bracket off an older bike equipped with Shimano Exage cranks. I pulled the non-drive side crank using my handy dandy Park crank pullin' tool, but when I went to pull the drive side, it looks as if there is a more coarse threading on that side. Am I missing something obvious? I've never pulled a Shimano crank, and I know they have some special mojo but I understood that had to do with how the BB was mounted in the shell.
I'd post an image of it but I don't have the requisite 10 posts to be allowed to do that (or links of any kind, apparently). So I've put up a page about it with an image of what I'm seeing.
the7000project.wordpress.com/2017/08/16/crank-thread-difficulties/
Clues for the clueless?
Thanks!
Originally Posted by
jeromeoneil
That's what I was afraid of. It's a '93 Trek that was handed down from a long line of bike geeks, so it wouldn't surprise me if one got nutty with a tap and die set.
Amazon Prime is my best friend for a reason. Any particular size wedge I should buy for this?
Thank you for the help!
...it's remotely possible that one of the previous owner bike geeks had one of those BR or VAR crank thread repair kits, and rethreaded it using that (which would make it appear both slightly larger and coarser), but then chose not to apply one of the standard repair inserts. If you have the tool, you can use it to pull the cranks without any problems. And the inserts are both a little pricey and often difficult to obtain.
The next guy (you) hasn't got the tool, so you're left with all these other inventive ideas for removal.
