Just after posting this I won an ebay auction on a German touring bike (Nöll) and haven't been using my Dahon since (been biking all the way to work instead of cheating by train most of the way). Got a cold last week and started using the Dahon again. I cut the chain by a lot! and so far no problems at all. Very simple solution it seems after all. Almost had forgotten how fun it is to ride a good quality folder.