Originally Posted by
joejack951
Cables don't stretch. The inner liner of the housing wears and so do the components of the shifter and cable stops. But 1.1-1.2mm stainless steel cables are more than up to the task of pulling a derailler without stretching.
They do, just not significantly enough to be of any importance. High quality derailleur cables are pre-stretched at the factory. Seating of ferrules, and cable and housing units into their respective places would totally mask any miniscule effect of actual cable stretch.
As you have pointed out.