I came across this way cool web site Cycle-Ergo which lets you choose a manufacturer/bike and change the position of pegs, bars, seat and anything other then wheel size (which can be fudged with seat height) to check how changing items on the bike will effect your riding stance. It also allows you to select more then one bike at a time and scroll from one to the other to see the differences in riding ergonomics!  This is a very cool tool for people looking to modify their bikes and compare it to riding positions of bikes you've ridden in the past  

http://cycle-ergo.com/