The Duckmeister wrote:Depends on the vintage of your RD. From 2012 model year (~Aug. '11 release) 105 was compatible with a 30T big sprocket. The new '13 model will accept a 32T. They recommend a long cage with 32, but it is possible to get away with a short one.I believe I can't go any larger than 28 on the rear with the 105. So if I wanted to grow some sideburns, I'd need a MTB RD yeah?
It's a 2010 model bike, so likely 2010 (or older?) groupset?