I really like the SRAM chains. On my last tour I took a PC-991, which worked flawlessly. One thing that nobody seems to have mentioned here is the PowerLink on the SRAM - you don't need a tool in order to remove the chain for repair or cleaning - which means a little weight saving. For chain maintenance, I really like the FinishLine chain cleaner (which you use on the bike - no need to remove the chain at all with this). Using this regularly with a citrus cleaner will ensure a nice long chain life. I've taken my bikes to the bike shop with chains that have been maintained regularly with a FinishLine, and the owner was surprised to see how little stretch wear there was on the chain given how many miles it had on it. I think regular cleaning helps to keep down the wear and tear, presumably by flushing out all the little bits and pieces that cause the wear between the bits of metal. The only downside is that you also need to carry the liquid, and rags to dry the chain off afterwards, but I see it as being one of those things that is essential to maintenance of the bike, along with lube. One important thing with oil is to not use too much - if the chain is too wet, then it'll pick up more dirt, which is obviously bad. Remember to lube after heavy rain, as that will tend to wash out the oil. Also, the Park Chain Brush is a good little tool to have along with you - very lightweight, and helps with getting the big bits off around the derailleurs and chainrings (remember to also clean the chainrings - no point cleaning the chain and then putting it back on a filthy, caked chainring).

Neil