Can someone who's tried and tested using a road front derailleur on a 2x10 mtb drivetrain enlighten me on some of the pros and cons? Obviously there's a lot of weight to be saved, but how much sacrifice is there to shifting under load? I'll be running XX shifters and a Hollowgram SL crank (39/26) on a 29er. It seems like the road FD might improve tire clearance compared to the much larger MTB FDs. The cage profile seems likely to be compromised since its designed for a much bigger 53 tooth ring... Anyway just wondering if this is the realm of weenie bikes that are designed for the scales and aren't really ridden on trails, or if its a good functional weight saving option....?
I'm very interested in this too. I would think the major factor would be the relative jump in teeth between the rings. For road, there's a 14t jump (for standard rings). For a 2x10; 39x26; its a 13t. So in that regard, perhaps it would work well. In actual design, a large difference in road/mtn FDs seem to be the size of the plate that pushes the chain up onto the big ring.. not sure what effect having a much smaller backplate would have on a 2x10.