Quote Originally Posted by indysteel View Post
In my opinion, you don't need that much clearance over a road bike. With your cycling shoes and bike shorts on, can you safely and comfortably straddle the 51? If so, you're good to go. I don't have much room to spare on my road bike and it has never been an issue.
Exactly...

PBH is a guide not a hard and fast rule. IMO, stand over height means very little on a bike you ride on the road. If you can straddle and you love the feel of the way it rides then go for it. Top tubes angles are different on different bikes so the 1 to 2 " clearance means zip.