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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 02-15-07, 09:38 PM   #1
sac02
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torque crank bolts to... ?

Hey guys sorry I didn't search, but I need a quick answer and sifting through search results usually takes me longer than just asking a simple question.

I have a cup and cone, loose ball, BB with a square taper campy spindle on my peugeot fixie conversion. Bulletproof bmx cranks (budget reasons).

What is the proper tightening torque for the crank bolts? The cranks just started to get a tiny bit loose, hopefully I caught it before the cranks have been irreperably damaged. I originally tightened the bolts as tight as I could get them with a 3/8" drive wratchet wrench, but I'm guessing that's not tight enough. I have a 1/2" drive torque wrench. What's the proper torque to use this time?

Mac
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Old 02-15-07, 10:12 PM   #2
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Sometimes the cranks loosen on the spindle after you initially tighten them and ride for a bit. I've heard that this is normal and also that it isn't... If I were you I would just tighten the hell out of them again and watch for loosening.
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Old 02-15-07, 10:36 PM   #3
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if the hockeyteeth's solution didn't solve your problem, I wonder if the taper of the spindle is the same as the crank's one.


is both of your crank loose?
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Old 02-15-07, 10:37 PM   #4
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german torque specs: gootentite.
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Old 02-16-07, 12:26 AM   #5
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Quote:
Originally Posted by hockeyteeth
Sometimes the cranks loosen on the spindle after you initially tighten them and ride for a bit. I've heard that this is normal and also that it isn't... If I were you I would just tighten the hell out of them again and watch for loosening.
+1. for about a week i carried a crank wrench with me to tighten the bolts after rides. longer than i needed to, but it gave me peace of mind to tighten the things down.
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Old 02-16-07, 12:32 AM   #6
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Quote:
Originally Posted by Baube
if the hockeyteeth's solution didn't solve your problem, I wonder if the taper of the spindle is the same as the crank's one.
I am a little worried about this; I read a little about it and it was always in the back of my mind when I put the bike together. I could never get a definative answer whether or not the bulletproof cranks and campy spindle had the same taper. They seemed to fit together ok, but I don't know how "poor" the fit should be if they are incompatible. Would it have been grossly obvious if they were?

Mac
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Old 02-16-07, 04:29 AM   #7
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Bulletproof and Campy don't mix. The damage won't be obvious until after a few hundred miles.


Quote:
Originally Posted by sac02
I am a little worried about this; I read a little about it and it was always in the back of my mind when I put the bike together. I could never get a definative answer whether or not the bulletproof cranks and campy spindle had the same taper. They seemed to fit together ok, but I don't know how "poor" the fit should be if they are incompatible. Would it have been grossly obvious if they were?

Mac
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Old 02-16-07, 07:24 AM   #8
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Torque = tight as hell.
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Old 02-16-07, 09:13 AM   #9
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Quote:
Originally Posted by Baube
is both of your crank loose?
all your base are belong to us

How about a spindle beer can shim? that's one of those things that I've always thought to try, but never actually done, because I can't imagine it working. But I'd like to know.
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Old 02-16-07, 09:34 AM   #10
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Torque values for crank bolts are manufacturer specific. Pretty much need at least 300 inch/pounds and most are spec'd higher than that.

Theres some basic values here:
http://www.parktool.com/repair/readhowto.asp?id=88
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Old 02-16-07, 10:39 AM   #11
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Quote:
Originally Posted by AfterThisNap
Bulletproof and Campy don't mix. The damage won't be obvious until after a few hundred miles.
Damn.

The problem is fixed for the moment. I torqued both crank bolts to 32.5 ft-lbs.

Also: when I got down there to really inspect things as I did the crank bolts, I noticed the adjustable side of the BB cup had come loose, about an eighth of a turn. The cranks were a little loose, but it turns out I was also feeling a little play in the BB itself. So that is now also fixed, we'll see how long it all lasts.

Mac
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Old 02-16-07, 12:52 PM   #12
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damn, should've read the OP more closely.
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Old 02-16-07, 01:24 PM   #13
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Quote:
Originally Posted by danish
german torque specs: gootentite.
Achtung! Keine Gebulletproof Crankentorquen mit die Campenbotzombrachet! Geblinkenflashen und Gespitzensparken!
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