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Ah OK thanks a lot. So it was option a and c :)
I'm not off roading the thing, and though London's roads are not exactly billiard table I don't recall my other bikes dropping chains all over the show or even ever, so I'm guessing if you got your front derailleur set up properly, and Look didn't see the need to add one themselves, then it isn't needed and is going. And will save 18g.
Ohshit hang on, have I just become a weight weenie.....
Deda Dogfang
Pretty much