Originally Posted by
stapfam
Have a 31" inseam and ride a 51 conventional size and an XS in Giant Compact (equates to 42).
Standover height does not matter- Unless it is too tight on the vital parts. What does matter is seat position and reach to the bars.
You could go right up to a 56 as long as you have an inch between you and your tender parts. If you can straddle the bike safely, it fits. As for the saddle and bars, those can be adjusted by changing seatposts and selecting the right stem height.