sorry, but you lot are not getting the point are you? the chain pitch alters..really? no shoot sherlocks! this may be a problem if you are running a magic gear or chain tugs. the chain wears, the chain is made of hardened steel. the front ring which is made of soft alloy wears with the chain. the rear sprocket which has tall teeth also wears with the chain. eventually the whole drive train is trashed, no shoot. BUT, with the half link chain, which in my opinion, for my purposes is brilliant, has stopped all my set up problems that i had with, the 9 speed chain and the KMC ss chain. so, as per my original post, which i don't think people have read, HALF LINK CHAINS ARE BRILL!!!!
by the by. have any of you lot actually tried to convert a full sus to ss? if you had then maybe you would know what i mean. full sus, 5 inch travel in my case, has a hell of a lot of chain growth and parallel rear stays which causes problems trying to get the correct chain length on full link chains, which means you have to push down on the slack, which causes severe setup problems. however with the half link chain NO SUCH PROBLEMS because you can get the correct chain length and push up.
god i hate clever arses