Looking at my bike the other day, I got to thinkin' (rarely a good thing!). . .what exactly is the difference between an XC bike and a freeride bike? I know the freeride bike is supposed to be able to handle jumps, etc. But I remember the guy at my LBS who sold me my bike (Trek 4500) telling me that they use the same frame on my bike that they do on their higher end bikes. So, is it just a question of wheels/components? Forgive the stupid question, but I really don't know. TIA.