Originally Posted by Leisesturm

You are doing all this measuring by yourself right? And you did not do any of them 3x with the results averaged (as is often recommended). I'm pretty sure of this. I know it feels dumb, but try to get a good (really good) friend to help you with the measuring so you can be in as natural a posture as possible. The cycling inseam is measured by taking a thinnish hardcover book and sliding it up past your junk so it is pressing firmly against your pubic bone. Then someone else measures from the floor to the top of the book. You are in your bare feet.

If you are not racing or planning to, all this measuring is really just to satisfy the inner geek. It isn't necessary. Get on the bike in your bare feet. Put your heels on the pedals. Sit naturally with one hand on something to support you. Pedal backwards. Adjust the seat to a height that allows you to do this smoothly. There. You just set your saddle to a height that allows you to ride the bicycle. No tape measures, no snickering 'friends', no math, no brainer. If you feel like you want to raise the seat a little after you have ridden it this way for at least 10 miles... go for it. Likewise lowering it. It's your bike. But if you find that you can put a foot down at stops without getting off the saddle, it is too low.

KOPS is impossible to measure by yourself. Don't even try. You get meaningless results (like 2" off). You assume the 56cm frame is sized properly why? Anyway, its not (really) important. Here is what I would do in your (cycling) shoes: 1. center the saddle over the seatpost (equal amounts of saddle rail on either side). 2. Put my elbow on the nose of the saddle and reach my fingers out towards the bar. I expect the tip of my longest finger to just reach the back edge of the handlebar. Add 1" if you are a real man, subtract 0.5" if you are a wuss. Kidding. Kind of. The differences can be made by moving the saddle back or forth, or by buying shorter or longer stems. Obviously one way costs money and the other doesn't cost anything. Your choice. Go out and ride. Give things a good month or two before deciding what to do next.