Why one inch? Everyone has different proportions so standover is over-rated. Ride comfort is most important and sometimes people feel better on a larger frame. I had a Fuji League that was a size bigger than what I normally ride but the geometry on it made it feel as good as some of my smaller frame bikes. That had very little crotch room for me. If I went by 1" of clearance I would be riding a small frame that would be uncomfortable to ride. If that stat works for you that's great but it's not for everyone. That's why actually riding a bike is the best way to see what size works.