thanks Igualmente

according to different websites i may need size bike with ett 54-56cm depending on my height. some even say i need ett 56-58

my cyclist friend says that measurement for aerobike is different from conventional road bike. is it true?

the ett for the bike above is 535mm (size 50). it does look smaller. but the seller said if i buy the bigger size, i have to lower down the seat post and i will look awkward. the problem is the seller is only a dealer. he doesnt have every bike size..