Originally Posted by bruce19

The only caveats I would add would be to do this all in CMs assuming the bikes are sized in CM. When I convert a 36" inseam to CM and do the math, I get a 60.8 CM frame measured C to C. And, be careful with measuring saddle height from center of BB because it won't work if you have bikes with different crank arm lengths. As I said this always gets me in the ballpark. From there it's a matter of adjustments. I'm just sharing what has worked for me.