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@chris0
Another geared chain length query...
I've always used the Big-big combination plus a couple of extra links method to get chain length and this has always worked. however, on my 105 groupset it results in the rear derailleur being pulled forwards quite a bit more. It looks like the chain is too short.
I'm wondering if it's to do with the 105 rear mech being longer? It is the short cage version I think, but looks a bit longer than the Dura Ace one I have on another bike.