On Feb 21, 7:35*am, James wrote:
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.

I'm assuming it's elastic deformation. I've always liked the Connex
design as its the same proven design as the old Renold bicycle chains
and they never gave trouble. The exact conditions of service are hard
to pin down and it's best to go by proven designs. 1/8" bushed chain
isn't used on the track for fanciful reasons, it's used because it
works and doesn't break.