really just two, I got my first road and mountain bikes through some kinda deal, mt bike was an end of season sale and the road bike was an ebay purchase. I rode the mt bike for....5 years? and road for about 4 before upgrading, and the second bikes are both better fits. I really didn't have the money to buy a new bike from a shop until then, getting the new bikes was really a financial decision. But going to a shop and test riding really made the different for me, no big struggle. For my road bike I started with a Specialized Allez Sport, it was a TOUCH big for me and started to bother me when I'd worked up to 20mile+ rides, and it was replaced with a Jamis Quest, which so far seems a perfect fit, although I think I've only got about 500 miles on her. Original mountain bike was a Schwinn Moab, I actually thought it fit fine until I got my Santa Cruz Julianna, which I do MUCH better with, although Schwinn has been outfitted with smooth tires and is my current commuter/city bike.