If this is your bike: http://www.specialized.com/us/en/bik...mpact#geometry , then you have a thresdless- and you're limited as to how much you can raise the bars, by how much steerer tube they left sticking out (The thing that the stem clamps onto). That probably would be a good part of the solution though- if you can get the bars high enough. See, with a larger bike, your effective seat height could be the same as it is on that bike, but the bars would already be where you need them, or have enough room for adjustment. But as others have said before, if you can raise the bars by turning the stem T'other way around, etc. then it might help......but again, this would be so much easier if we had a pic (Put a bag over your head or something if you're worried about privacy or making us vomit )