I own both a mtn and a road bike. As you are serious in cycling, I would strongly recommend that you buy a 700cc road bike as well. Its always good to try out new thing to get a brand new feeling on cycling.

I own a road bike for thirteen years before I bought my mountain bike this year. Now. I enjoy this mtn mountain bike very much on endless rugged terrain and short distance coummuting. I should said that the mtn bike is such a agile and stable machine that every cyclist should try it and own one

However when it come to long distance road cycling 15 mile above, I would said Never!!!! to a mountain bike. This is because a 700cc bike would outclass it obviously (speed 15-35% faster, comfort 15-25% better and energy saving 20-35%)

I hardly got any sweat using a road bike for a long distance, but will got half of my T-shirt wet when using a mtn bike for the same speed. so you can see how much the difference will be.

A road bike with 32mm tyres & above will also run well on trail. so don't worry if you are planning to explore some off-road terrain during your tour

Remember to buy a light weight double butted road bike with the right size designed for touring , and you will be assured to have a good time in your tour. Good Luck my dear friend