Originally Posted by
easyupbug
I have a Mitutoyo dial caliper on my bench so use Campagnolo's hard rule that you toss anything over 132.60mm which, though I have not checked, might be just under 0.5%. It is quick and easy and chains are relatively cheap so I follow their advise to "immediately" replace if even one measurement is over 132.60mm.
Really?
Measuring my own (non campy) chains from new, in the way recommended by campy, they measure right about 132.25mm according to my digital calliper. 132.6mm is then 0.26% "wear" before binning it, and the campy method even includes roller wear (enlargement of the hole in the roller, - the outer diameter stays roughly the same), that in my experience is more pronounced than actual chain elongation. Seems overly conservative to me and I've certainly gone much further with no issues. 133+ mm before I even consider replacing the chain.