Ive checked online and couldnt find the documents. If a 200lb man were to use his full weight on one foot to brake and the bike had a 7" crank mounted to a 10" diameter chainring it would be 280lbf on the chain. The tensile strength may very well be way more than that and intermittent application of such forces may be perfectly okay but it would be nice to know what the tensile rating actually is
I've had a conveyor chain on my 1893 Featherstone Road King for about ten years, and I've raced the bike and ridden it on centuries. The bike has a small chain ring and rear cog, which actually increases the load on the chain. I am a light older rider, but a strong friend who weighs more has also ridden the bike on centuries, and my teenage son has match-sprinted it. My friend once tore eight double-butted chrome steel spokes out of the rear wheel, but the chain was fine. A conveyor chain is essentially identical to a TOC block chain except that the side plates are not drilled for lightness, and I'm sure the metallurgy has only improved over the last 120 years. So don't worry about riding hard on a conveyor chain.
Oh, we are Wheelmen. Riding old bikes hard is lots of fun!
Paul Rubenson
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