You want to have stand over clearance, but not a whole lot. Also when you have the seat adjusted for the proper leg extension, You don't want to have to have a super high seat post. If you do, the bike is most likely too small. The bike should be long enough for you (top tube length) but your better off searching for bike by seat tube length. How tall you are and your inseam will determine that, and there are alot of online sites that can calculate it for you.