Thanks... Cervelo's stand over height is measured directly over the BB (not really where you'd 'stand over'). Measured vertically 12" from the center of the seat post I am a 51cm and not a 54cm (damn, there is a 54cm on sale for $3,750 fitted with DA, Easton Circuit wheels and an Easton EC-90 SL fork)... there will be more sales.