Originally Posted by
cxwrench
What you're missing is that the bicycle frame is designed with a fatigue limit far far above that theoretical 66nm. That being the case if the frame is manufactured properly it will never get close enough to that limit to 'wear out'.
86 Nm at a 25% climb
Metal frames are operating under the fatigue limit at all times? CF frames never fatigue? Why do they eventually crack, then?
It’s a bold claim which doesn't seem to be supported by any literature which examines bicycle frame fatigue.