Campag ultra-torque cranks busted
Moderator: robbosmans
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If you plan on getting another "old style" ultra torque crankset, the chain rings are worth savings. Alternatively, put them up in the on sale section/ebay.
Glad to hear you are ok!
Glad to hear you are ok!
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Calnago wrote:goodboyr wrote:No torque wrench could be either under or over torque.
Exactly... don't really care if it was under or over, it would just be my first question to the installer... Was a torque wrench used? And did you torque it to spec? If not, well...
I always torque that bolt to 50Nm, right in the middle of the spec range of 40-60Nm. Never had a problem.
At some point, Campy issued a Service bulletin of sorts that instructed to torque the bolt right to 60Nm, and not to the lower part of the printed range.
60 N-m is a lot of torque for that rather thin gauge/small pitch center bolt. I have always torqued them to less than 50 N-m without issue and thought that was a lot of torque.
Not disputing that the spec may have been changed....change in bolt metallurgy spec may be at the root cause....isn't the center bolt for SR titanium?
Not disputing that the spec may have been changed....change in bolt metallurgy spec may be at the root cause....isn't the center bolt for SR titanium?
SR Bolt is titanium and for some reason reverse threaded. Snapped one recently because of ignorance in tightening to torque spec. Didn't crash, luckily. Bolt head had snapped right off. A replacement titanium bolt, being left threaded and all, is very difficult to come by but eBay managed. Made in Italy and sold only in us, it seems.