My mtn.bike is older, and has 26" wheels. My height would allow me to go with larger wheels if I was to buy a new bike, which I'm not planning on. If I was buying a new bike, I'd probably go with a larger wheelset, as I do ride some trails with rocks and roots that a larger wheel would roll over easier. I'm doing ok with the 26'ers, but feel that larger would be better for the trails I ride. All depends on what trails you are riding and whether you feel ok on the bike with larger wheels.