Originally Posted by
rustymongrel
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At this point I feel 1/8" chains, like thread on cogs, are simply a tradition thing. Given improvements in steel quality and manufacturing a 3/32" or even narrower chain can likely be stronger than a 1/8" chain could be 30+ years ago. Mountain bikes use 11 and 12 speed drive trains these days and see all kinds of extreme torque.
Another factor to consider regarding chain width is the bearing stress imposed on drive train components. For a given chain load the bearing stress on a 3/32" cog tooth is around 30% higher than on a 1/8" cog. Thus a 3/32" chain will reduce the life of a cog. I also believe there will be more wear on the chain and also increased friction in the drive train.