Campagnolo recommends changing the chain when the distance between 6 links is 132.6 mm, this corresponds to an elongation of 0.6 mm for 6 links. The chain should be replaced when it stretches more than 0.1mm per link and this is Campagnolo's suggestion. Interestingly this high quality tool also uses 6 links to measure and has 2 measurements, one with 0.1mm stretch per link marked both 0.1mm and 0.075mm which Roholoff says should be used for alloy gears . I use .075 chain which is cheaper than CGOs and sprockets.
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