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Old 06-09-06, 07:59 AM   #1
mattface
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square spindle cranks how tight is too tight

I'm always nervous about over tightening my cranks, but I think I under-did it instead. yesterday my left crank arm started making a slight creak, and when i rode slowly, and applied pressure in both directions I coulf feel it move slightly. When I got home I tightened it up. It was way loose.

I rode it to work this morning, only a couple of blocks, and it was still creaking, so I walked home, got my allen wrench to tighten it down more.

Hopefully it's not wrecked, but I realize it probably is. the only thing I can think to do now is tighten the hell out of it, and hope it holds. My 8mm allen wrench is only 4" long, but when I put my weight to it (200lbs) I feel like I could push it too far, so the question is how far is too far, and how can I tell without a torque wrench?
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Old 06-09-06, 08:29 AM   #2
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Update: I found the Torque spec on Park Tools site 312-324 inch-pound

I suppose it means I should apply not more than 81 pounds of pressure to the end of that wrench. I still don't know how to tell if I'm overdoing it though.
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Old 06-09-06, 08:36 AM   #3
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You are not really applying the force of your hand to the very end of the wrench unless you are hanging from it by your pinkie, so I (who am admittedly not expert) doubt very much that you are going to overdo it with a 4" allen wrench. I would think that if you tightened it and it's still creaking that you're probably right about needing a new crank.
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Old 06-09-06, 08:38 AM   #4
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Put a pipe over your hex key so you have a foot of leverage then push with nearly 30 lb. That will be easier to estimate.
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Old 06-09-06, 09:18 AM   #5
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Quote:
Originally Posted by AndrewP
Put a pipe over your hex key so you have a foot of leverage then push with nearly 30 lb. That will be easier to estimate.
Yeah that worked a lot better. It went tighter than I had it (which was way tighter than before) without that scary feeling that I was about to break something. So here's hoping I didn't wreck it and it stays put. thanks for the input.
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Old 06-09-06, 03:14 PM   #6
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Oh my....

I put the torque wrench on my crank bolts and discovered 32 foot pounds was a LOT tighter than I expected. then I realized I should have divided by 12 instead of dividing by 10. I put on 5 pounds too much.

So now what? is 5 pounds over spec bad? Should I just leave it be, or should I remove them and retorque to 27 foot pounds?
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Old 06-09-06, 03:34 PM   #7
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Leave it be. IANAM
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Old 06-09-06, 04:57 PM   #8
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Don't mess with it; you're good to go.
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