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08-04.-2004, 10:30 PM
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#1 |
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Guest
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Re: Torque wrenches
peter-<< They're not essential at all. I can't think of a really
torque-sensitive fitting on a bike. >><BR><BR> think, 'crank bolts'.... Peter Chisholm Vecchio's Bicicletteria 1833 Pearl St. Boulder, CO, 80302 (303)440-3535 http://www.vecchios.com "Ruote convenzionali costruite eccezionalmente bene" |
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09-04.-2004, 02:35 AM
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#2 |
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Guest
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Re: Torque wrenches
"Qui si parla Campagnolo " <vecchio51@aol.com> wrote in message
news:20040408093057.12498.00000016@mb-m26.aol.com... > peter-<< They're not essential at all. I can't think of a really > torque-sensitive > fitting on a bike. >><BR><BR> > > think, 'crank bolts'.... Crank bolts was indeed the application I had in mind. Certainly crank bolts can be under-tightened, but can they be over-tightened? The nominal torque usually given for the typical 8 mm bolt is around 30 ft-lb (pretty much max torque) where yield might be 40 ft-lb, so tighten too much & the head snaps off. Lubricating threads, heads, washers, etc. can make a 25% torque variation, as, in this case, can lubing the tapers. The idea is to get the right clamp force, torque is an approximation of that. I interpret the crank bolt spec as "tight as you can w/o popping the head". I've never popped a head or had a crank loosen, so my impression is that there's a fair amount of leeway in even that "torque-sensitive" application. |
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09-04.-2004, 10:03 PM
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#3 |
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Guest
Posts: n/a
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Re: Torque wrenches
peter-<< Certainly crank bolts
can be under-tightened, but can they be over-tightened? >><BR><BR> Sure, I have seen many fall off(under tightened) or those having the small ring resting against the right chainstay(overtightened) and a few with sheared off crank bolts or split crank arms. Peter Chisholm Vecchio's Bicicletteria 1833 Pearl St. Boulder, CO, 80302 (303)440-3535 http://www.vecchios.com "Ruote convenzionali costruite eccezionalmente bene" |
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