I'm not being flippant when I say this: any gearing is adequate if you're willing to walk your bike up at least some hills. The question is how much will you have to walk it. The hills you expect to ride are a big factor in that. Your conditioning is another big factor. A lighter bike helps, and the Roubaix is a heck of a lot lighter than an LHT, but not enough to compensate for the very high low gear it has. I can't say whether that should matter to you.