Originally Posted by
PebbledChin
I did read your FAQ a day or two ago. If you are convinced that a new chain would help, then I shall invest a few pounds, but I thought that chains for derailleur gears were flexy from the outset, else the derailleurs wouldn't be able to do their job? The other aspect is that the Swift is pretty rigid, so I don't know why it should have the propensity to drop its chain like other folders, except for having 20" wheels. So do all small-wheeled bikes (with short chain stays) suffer from chain drop because of the increased angle of the chain when cross-geared?
The Swift has normal road bike geometry so that isn't why. A new chain will be better but that only lasts for a short while before sideways play increases. Wolftooth chainrings have been invented for the MTB crowd because with a single ring up front they have the same problem. Nope, your only solution is getting the guard as close as possible. Having one that is a bit larger also helps. And it's not because of extreme cross-chain gearing, it's a normal thing. Any gearshift might drop it.
I made a light guard that bolted to the seat tube before going with a front derailer.