Originally Posted by
fietsbob
A MTB , will tend to be Longer top tube,
Agreed. When I converted my Trek 900 MTB to drop bars, I found the hoods were placed much further out than they are on my road bike. Took a couple of handlebar swaps and some experimenting to get things where I found them comfortable. Reach to the bars is far more important than standover height. My feeling is that the standover height rule-of-thumb is just to get you in the neighborhood of the correct size. I have shorter legs with more height in my upper body, so I tend to ride a slightly larger road frame than my height would dictate.