This is presently my commuter, built-up to XC race specs. At 21lbs- I shock road bikers, as I blow by them, at 35mph. The super-light Optimo frame, Kenda Klimax race tires, Mavic XC717/DT Swiss 240s wheelset, and 11-25t Dura Ace cassette altogether makes this bike climb like a billy goat on crack.