Think I just shredded Cook Bros cranks

Davetrials · Sep 30, 2014

Picked up a Stumpjumper M2 frame with a pair of fairly worn Cook Bros cranks

Was in the process of removing cap on drive-side (pictured), had to apply a good bit of force (anti-clockwise), then very unpleasant feeling as the allen key completely gave way

As you can see, it's basically circular now

Anything I can do to get the crank off the bike? or will they be a permanent fixture now?

ridevintagemtb · Sep 30, 2014

dremel a slot along the diameter so it acts like a big flathead screw. Loosen with a dime or flathead screwdriver.

Thias · Sep 30, 2014

That cap is replacable. You could also try to hammer a torx in.

But the question is: Why didnt it come out in the first place?
Apply oil first?
Maybe a bit heat would help?

:roll:

Davetrials · Sep 30, 2014

Thanks - I used a good size allen key, which went in very deep, which is why I am surprised it gave

Not to sound like a moron here, but is there any chance that these particular cranks open clockwise on the drive side?

Thias · Sep 30, 2014

This is only a "thin" cap, that hides the big screw underneath.

Them caps screw into the same thread as the puller tool does. And that is a "normal" thread. They come out anti clockwise.

Edit: This is how they look like from all sides:

pic taken from http://www.bikepro.com/products/cranks/ ... ts-n.shtml

mkozaczek · Sep 30, 2014

I had this happen and used a bolt extractor. Worked like a charm.

ridevintagemtb · Sep 30, 2014

mkozaczek":dv3yqp9l said:
I had this happen and used a bolt extractor. Worked like a charm.

Also called "easy outs" in my world.

dillbike · Sep 30, 2014

These have saved me a few time's.

http://reviews.canadiantire.ca/9045/054 ... eviews.htm

hamster · Sep 30, 2014

I'd go with the torx approach. If you taper the ends of the splines a bit with a file then it will go nicely in. It also doesn't preclude using more invasive methods (such as dremel or easy out) later.

mkozaczek · Sep 30, 2014

Bolt extractor worked in about 2.5 seconds and I did it by hand without any tool handle required

Think I just shredded Cook Bros cranks

Davetrials

Old School Hero

ridevintagemtb

Thias

Davetrials

Old School Hero

Thias

mkozaczek

ridevintagemtb

dillbike

Retro Guru

hamster

Retro Wizard

mkozaczek

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