I did talk my LBS and learned my options. I can go 13-26 with no modifications but that really doesn't add all that much. Or does it? I've been caught in my highest gear struggling several times lately and while one more would've been nice, I'm not sure that is the final solution because the hills I've been on haven't been that bad!

If I have the medium cage on my bike, is there a longer one? To get to a 13-29, I'd need the long one but I'm not finding it. Also, if I change this out, will anything be compromised? My bike rides well and shifts well and the last thing I want to do is mess with it and have it do things like lose chains, etc.

Does anyone have experience with this? Would I lose anything by changing this?