[piecesparts]

Believe me the rotational mass of the 17" aluminum wheels, on my truck is much less than the rotational mass of the steel 15" wheels that were on it before. Granted the mass is approximatel a 1" radius further out, the weight of the wheel is so much more less and the affect is so minimal that you would not see it. However, you slap a larger tire on that 15" wheel and the weight of the rubber becomes paramount in your calculation of the mass and it will amaze you with the result. That is why the guys with monster mudder tires on their 4X4s cannot stop. This is basically an insignificant item in these sizes. My DD just went from the 17" tires and rims to the old 15" tires and rims for winter and the stopping has not changed in any appreciable amount.