kingrollo
Guru
Because all the bike set up in the world wont affect the bikes geometry, and hence how it behaves and feels in your hands and under your butt. You won't know how that feels, and thus whether you will like it, until you've had a spin.
dunno, look at stack and reach figures and you can see a bike that has long, stretched out position...or one that will put you more upright.
dont think i have ever test rode a bike before purchase...look at TT , stack and reach....then a trip to adrian timmis who fine tunes the position