I'm 5'10" with a 33in inseam. I currently ride a Seven Elium SG with a 56.9cm effective top tube and a Seven V-II 56.8cm effective top tube (both have sloping top tubes) with 100mm stems. Looking at Pinarello Prince or Dogma sizing, going by top tube measurement, it looks like I should fit a 56cm (56.5cm top tube). But, I keep hearing how that Pinarello frames run big. Does Pinarello measure effective top tube differently than other companies? Or, do the bikes run big because of the horizontal top tube? It sounds like most Pinarello riders around 5'10" are riding 55cm (or even 54cm) bikes. Are they just compensating for the shorter top tubes by running longer stems?