Pint-Sized Gnar Shredder
Join Date: Nov 2007
Location: Somewhere between heaven and hell
Bikes: '09 Jamis Komodo, '09 Mirraco Blend One, '08 Cervelo P2C, '08 Specialized Ruby Elite, '07 Yeti AS-R SL, '07 DMR Drone
You're thinking about wheel size. Non-department store bikes are actually measured by their seat tube size (a bike with a 24" seat tube would only be suited for the very tall, and a bike with a 29" seat tube would likely be too big for Shawn Bradley). The best thing to do is buy from a local shop, where you can try on various bikes to see what fits and feels best. Even two bikes with the same seat tube size will have different geometry (the reach and stack will be different), so they will ride differently, and one will likely feel better than the others.