Zinn and 'Friction Facts' on chain measurement

[thwart]

Figure many here have already seen this, but some useful info, including the part about 2 watts lost per 1% chain elongation:

http://velonews.competitor.com/2015/12/bikes-and-tech/technical-faq/technical-faq-chain-wear-measurement_390085

[kramnnim]

Interesting how new chains are not all the same length.