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Just to add to what the others said about road bikes...Most of the problems people get from road bikes come from having the wrong size of frame. Having the correct size is much more important in road biking than in mountain biking. Simply look at how many sizes of mountain bike frames there are compared to road bike frames. Good mountain bike frames come in three or four sizes per model (five if you're lucky). Good road bike frames come in six or seven sizes at least. There is a reason for this.
Unfortunately for the sport, most bike dealers are accustomed to pushing cross and mountain bikes out the door (without paying too much attention to how the frames fit the cyclists). You can get away with this with upright handlebars, but you can't with road bikes. And since dealers make most of their money pushing tons of $300 bikes out the door, it's only the extraordinary dealers who will spend the time necessary to fit someone to their $1000 bike.
Road b...