I just sold my bike and im looking at either an 08 Demo 8 II or a 08 Iron Horse Sunday Team. But basically, what i was wondering is if riding a smaller bike somehow hinders the performance? I should definitely ride a medium, im about 5'9 or 5'10, but i really like smaller bikes. When im talking about performance im mainly talking about downhill performance. Ive heard the Athertons ride or at least used to ride XS bikes and it definitely doesnt slow them down. So if anybody has any input just let me know. Thanks!