I'm just getting knee deep in a revamp of my '84 raleigh record ace, and it's only right and fair that she gets a nice new chain. It's got a 6 speed cassette on there, is there any problems to look out for when buying a chain? Is there an weight benefit to fitting a chain designed for a 9 or 10 speed bike due to their thin-ness, or would I just be asking for trouble? And can I do that anyway? Am I right in saying that so long as I don't put a chain designed for a 5 speed cassette I'll be OK? Any suggestions for specific chains?