Hi, I'm hoping you kind folks can help me out. I'm a motorcycle racer, and I'm trying to find a *simple* formula for calculating how much mass addition/reduction to a wheel will increase/decrease the force required to change the direction of the motorcycle when at speed. Basically, to turn a motorcycle, you push on the handlebar in the direction that you want to turn, which "deflects" the wheel. The problem is that when you're going fast, the wheels (and other engine internals) are moving fast and so steering the bike at speed a certain amount requires more force than steering it the same amount at a lesser speed. So I'm interested in knowing how to calculate, for a (for my purpose) uniform disc rotating around its center axis, how much difference additional or subtractional weight would make on the force required to turn the bike at a given speed. For example, if the wheel weighs, let's say, 12 pounds, I want to know how to calculate how much "force" is required to pivot it on its axis at, say, 100mph. I need a formula that I can understand, because I've been out of college physics and calculus so long that I don't remember what all of the greek symbols represent, and so on. Thanks in advance for any help with this problem.