I have seen a lot of these cable frays on 10spd 105 (and I think shimano might have admitted and engineering problem and done a fix) but I have not seen it occur as much on 105 11. Do you guys see that also?
Its also worth noting I have seen some mechanically bad choices and quality in cable routing that can amplify the wear on the cable. Housing and ferrules not being set up they way they should have etc...
- james
www.buckyrides.com