hello,im wanting to change my frame sometime in the next few months,i've been looking through sites seeing whats on the market ,and now i have come a bit stuck . i just realised that i dont really know how frame designs affect the way a bike rides. i know how that a higher bb makes being on the back wheel easyier but picking the front up for a muanual a bit of a bitch,but this is really the only thing i know how frame designs affect riding.so ,here are my questions. . . . 1. what difference do head angles make? 2. what difference does a longer wheel base make compared to a short wheel base? 3. how do chainstay lengths affect a bike? 4. how does different BB shell head tube lengths make a difference? also what moves are generally easyier with certain frame geomentry? oww yeah before people say ,i know that changing stems,bars ,forks etc make a difference . any help gratefull,steve