|stripping shimano chainring bolts like crazy||sodade|
Apr 14, 2003 5:36 PM
|I bought a torque wrench today. I set it at 80lbs per Zinn's 70-100 for a chainring bolt. I turn and the inner hex of the bolt shreds. The socket allen wrench is now imbedded in the bolt and requires a vise and some creative hammering to get it free. I figure - it must habe been bum luck so I go for the next bolt as cautious as a mouse and it happens again. What am I doing wrong?
Thanks in advance...
|inch ponds or foot pounds lol!!!||the bull|
Apr 14, 2003 6:24 PM
|Christ you torque a car wheel to 80 ft lbs!inch pounds!!!not foot!!|
Apr 15, 2003 4:07 AM
|Unbelievable! The book calls for 80 in*lb, and he gives it 960!!! Can you say "torsional failure"?? Sure, you can!|
|so do I devide by 12 then? -nm-||sodade|
Apr 15, 2003 8:10 AM
Apr 15, 2003 9:05 AM
|Apparently, no one else here has ever made such a mistake.
No big deal; drill out the old ones if nec. and replace 'em.
|get another torque wrench||DougSloan|
Apr 15, 2003 9:43 AM
|I have a 1/4" drive torque wrench calibrated in inch/pounds. Something like that would probably be preferable to a larger one and dividing by 12.
Nonetheless, you shouldn't need a torque wrench at all for this. I've probably tightened and loosened chainring bolts a thousand times without one and never had a problem. Lube the threads to make tightening smooth and removal easier.
|fyi: torque wrench advice at Velonews||DougSloan|
Apr 15, 2003 10:39 AM