I'm struggling with planning an upgrade for my 2012 R5. It presently has 1st gen SRAM Red with some 2nd gen components.
Specifically, I switched to the exo gram chainrings, which although specced as "11 speed" work fine with my 10 speed setup. Also swapped in the xg 1090 11-28 cassette, which is MUCH quieter than the old one. My LBS put in the yaw derailleur, and all these work fine. However, my old knees are really starting to want an even lower gear, as we have some real steep inclines in northern NM, so, I'm contemplating options.
1. What I'd like: SRAM etap wifi with 50/34 and 11/32. However the R5 frame has the front derailleur hanger problem and the FD cannot be lowered quite enough to work properly, at least so says the LBS and also SRAM if you call them. One solution, proposed by a good mechanic at the LBS, is to file the FD mount 2-3 mm to get the FD in the right place. Obviously there is some risk in this, but it may be within bounds of structural strength.
2. The other notion, that just occurred to me today is to switch the chain rings to 52/36, or possibly 52/34. Either of those would still give me a lower climbing gear, and the 52T chainring allows (according to SRAM) a 4 MM higher FD position. I don't know if the 52/34 will work, although it is technically outside the bounds of what etap is specced for.
3. Or, go the cheap route and switch to the 2013 Red aeroglide RD, and put on a PG 1070 11/32. This is much lower cost, of course, and is all within SRAMs official specs.
I'm mostly looking for advice on (1) filing the FD mount, and (2) trying a 52/34 chainring setup with etap. Both of these are attempts to work around the FD mount issue and I'm wondering if these will work well.