I've been tossing around the idea of either getting a new bike or upgrading. I've been trolling boards for responses to this common question and it seems to come down to "If you have a good frame, upgrade. If not, get a new bike with a good frame." ...which is all well and good. But what's considered a "good frame"?

I've been sporting an '05 Specialized Roubaix for almost 10 years now. Bought it when I started doing triathlons with a friend, mostly for fun but competitive with each other and myself. I haven't used it "heavily" in the past, just enough to keep up for 25-Mi portion of the races. As I've become more running-injury prone, I've started cycling more. I'm to the point where I really only run if I'm doing maintenance on my bike. I'm thinking I'd like to try a century race next year and maybe some of the more local-ish bike races. I live between the Adirondack and the Catskills and would like to do some mountainous rides.

Haven't really had any issues with my bike. I'm relatively comfortable doing 40mi on it. With the exception of some hot-spots on the feet, it seems to fit well enough. Biggest complaint I have is that I can just barely get 700x25s through the brake calipers, and I'd like to go a little bigger. Could probably fit 28s if they were were deflated before going on...which is probably all I really "need". I do most of the maintenance on it (for better or worse) and it's time to start swapping out most of the drive train. Needs a new chain, rings, cogs, crank.

...or I can get a new bike! I really like the idea of having the option of wider tires. So I'm thinking disc breaks (and through-axles for good measure). I was testing out SL4s and Diverges and both had that great new-bike-feel. Local shops probably won't have the new '17 Roubaix in till next year, and I'd really like to try that out. But besides discs, bigger tires, and gear mount points on the Diverge, I don't know if the frames are that much "better" than what I have now. I've found in reviews that they both weigh in at about 17lbs, but I don't know how much of that 4 lb difference from mine is in the frame vs wheels.

My original thought was to get wheels good enough to go on a new bike in a couple years, get a power meter and a new computer to start training more effectively, and to start replacing/upgrading the components that need it. If I want to get away from the 3x9, then I'm essentially looking at adding shifters + derailleurs to the mix...which is breaks and a BB away from replacing the entire group...which makes me wonder if a new bike would just be smarter.