Which Groupset?

Two things:

1. if your rear spacing is 126, you should be able to get a 130 spaced wheel in there with some effort.

2. I remember reading (I think on sheldon brown) that 11 spd is not such a good idea if you do the above, as the chain may rub the frame in the smallest sprocket.. May be wrong about that.

I'm > | < this close to converting my Merckx (126mm rear) from 7 spd shimano to 10 speed Veloce..

I currently have full Force group (compact) running perfectly smoothly on a converted 126 spacing steel frame - BUT I did have the stays properly respaced to 130 when I took the frame in for a respray.