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Chain stretch - actual tech.
I just came across this;
http://www.cantitoeroad.com/docs/con...ns_Stretch.pdf I can't see whether the stretch was plastic or elastic. The length doesn't appear to have been measured again with a 10kg load. If it's plastic ... ouch! I hope it's not. I don't think it can be. 0.5% under 150 kg load. 39 tooth CR has a radius of about 79mm, and 175mm cranks gives a force multiplier of 2.2. A 75kg dude could easily stretch a stretchy chain 0.5% just by standing on the pedals. -- JS. |
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