Ive been meaning to ask the ladies of the forum this very same question myself, so I can only offer advice of the don't-do-what-I-did variety. I am not quite as tall as you are and am a bit heavier, and had experienced a problem with spokes breaking on my DiamondBack hybrid once I began consistently riding more than 75 miles per week. I'm guessing that means a road bike would be out of the question- in my case anyway. The first repair shop assured me that my weight was not an issue since it was a hybrid bike, and hybrid bikes are supposedly designed to withstand tremendous forces. Perhaps they were being diplomatic. The second time it happened, I limped back to a bike shop quite luckily located near the trail I was riding and was told that I needed a much more sturdy wheel, and they produced a nice hand built, double walled mountain bike wheel and popped that sucker on right then and there. I've ridden 500 miles on it with nary a problem. So definitely spend a little extra making sure your back wheel is nice and sturdy.