In the meantime I'm coming to terms with a two year old 6speed Brompton with probably less than 500 miles on the clock. I went out on it a couple of days ago and in the unaccustomed quiet I became aware of a faint ticking noise which left me wondering if the chain was feeding accurately onto the sprockets. I've just spent a wet afternoon finding out how it works (?!!) and learning how to balance the stop screws aginst the cable tension. I'm pretty sure I've got it right - smooth shift, no overthrow, and decent gaps between the pusher and the pulley - but I have noticed that the chain isn't landing correctly on either sprocket. I can see it centering itself 3 or 4 teeth after first engagement.
Of course this is bike inverted with no load. Its not severe and might correct itself in normal use but it's a bit disconcerting. If I spotted something like this in a conventional derailleur system I'd reckon to adjust it away just because. But with the Brompton system, except when shifting, the pulleys are free to slide across - you could say they are positioned by the sprockets.
Is this sort of thing just the Brompton version of normal, or is there some cunning technique that I could and should use to improve things?
