I remember someone saying on the forums that 4 lb on the bike was equal to 1 lb on the wheels, can't confirm or disprove this. I will ask my "fizziks" teacher monday about this and report back with a large formula with theta, pi, and a bag of other greek symbols so that we all may feel less of our selves :confused: . Anyways, taking weight off of anything rotational will improve your performance more than an equal amound removed from the non-moving parts of the bike. That said, what good would a formula do us?