Is there any significant difference between the way a road bike and a mountain bike should fit? I think my friend's mountain bike is too small. He complains that he feels hunched over when he rides on the road but says it's comfortable riding off-road. Compared to his road bike, which is comfortable, the mountain bike is shorter and the handlebars are considerably lower. He's also complained that the seat post isn't long enough. I've never heard of a bike that's only meant to be comfortable when riding off road but when I tried to tell him that his frame is too small he got upset so I didn't push it.