I have a Race Face Aeffect Cinch crank and the self-extracting thread is stripped. The bolt comes out but doesn’t push the arm off anymore. How the hell do I remove the crank arm now without destroying it? Any tool-free or DIY tricks?
by Sociedelic
I have a Race Face Aeffect Cinch crank and the self-extracting thread is stripped. The bolt comes out but doesn’t push the arm off anymore. How the hell do I remove the crank arm now without destroying it? Any tool-free or DIY tricks?
by Sociedelic
13 Comments
Go for a neighborhood ride and wait for it to loosen up… And sorry to say, but your crank is already destroyed.
Did u try to use the self extracting bolt in the first place ?
You might be able to remove it with a 3-arm puller tool. You can find those on Amazon or harbor freight for less than $20.
https://preview.redd.it/3hfrjblk3p6f1.jpeg?width=667&format=pjpg&auto=webp&s=40ccbc7a80f75268c4cb683d7e52ea799b568a26
Well you could always…
Can you get the original self extraction threaded back in?
[https://www.youtube.com/watch?v=9n1z2kwmL8o&t=3s](https://www.youtube.com/watch?v=9n1z2kwmL8o&t=3s)
Always thread the tool in all the way, apply some tension and shock it loose with a hammer.
You’ll need to drill and tap that to the next bolt size and helicoil it. If available.
No . It needs replacing. I get what you’re saying that the inner threads are fine and that the outer threads are stripped but why do you want to remove it if it’s not loose?
And if you put it back on how are you going to get it back off again. You can’t repair those threads due to the material being alloy.
I’ve removed loads of those drives side crank arms with a hammer where the threads have been fuct . You can use a heat gun or if you’re replacing the arm which is technically fuct you can use a grinder and cut a slot down the side of the arm and break it with a cold chisel.
The self extracting ring is the only way to easily get these off, and with no threads it’s unlikely you can remove it with normal methods. A spider tool is usually used to pull chainrings off e-bikes, requires a spindle for the tool to press against, with a hollow spindle there’s nothing to brace the tool. Potential solution is to thread in the extraction bolt, and then JB Weld the lock ring into the stripped portion, hopefully it holds tight enough for the extractor bolt to loosen things up.
My guy, it’s called a self extracting crank for a reason, why jam a non-fitting tool?
Pickle fork will get them off too albeit violently
Why were you trying to remove it?
The steps are
1) Put the bike on a trainer, ride till crank falls off.
2) buy new crankset
Alternatives to step 1 include large hammers and cutting tools
There is no longer an alternative to step 2
Order is up to you.
Hey a grub screw into the centre bore and then use a standard 2 arm puller on your chainring. Don’t use it on the outside as that will just bend it, but try to grab between the arms as close to the centre.