I really want to get me a road bike soon for longer rides, I have been putting around 100 miles a week on my mountain bike. The mtb is working out fine but I think the road bike would make the 24 mile round trip to my parents house much more comfortable plus I would like to start doing farther rides. That ride is all highway with a few slight inclines but my ride to work requires almost all side walk, very flat but kinda rough bumpy concrete. How well does a road bike deal with rough surface, I have never even sat on a bike with drop bars. Also there is about 1 mile of smooth dirt road to get to my parents house that I would be willing to walk if the thin tires can't navigate but would much rather peddle. How do you figure out the proper sizing of a road bike my mtb is perfect for me at 20". What ever I end up getting it will be used, probably from Craigslist so no initial help on selection from a bike shop. I guess what I am wondering is will it be that big of a difference between my mtb w/slicks and a road bike on longer rides and will the road bike be able to handle the rough sidewalks on my way to work without damage to it or me? Thanks to those who made it through all my rambling for what probably could have been writen with less typing!