Originally Posted by i12ride
If it doesn't matter then why would there be seperate chains for 8,9 & 10 speed?
because if manufacturers claim they're incompatible, then they're forcing you to buy a new one.
the difference between 8&9 speed chainring & cog thickness is 0.02mm it becomes more substantial between 8/9 & 10 speeds as there's a 0.2mm difference.
what realistically makes chains different is the outside measured width, the result of thinner joining plates