[Grandpa]

Originally Posted by DirtyD Actually, I don't think it is necessarily the weight factor. Pros don't run larger wheels simply because of the massive amounts of TQ being applied at the wheels upon launching the car. They need as much flexible sidewall as they can possibly get to gain traction. Plus, launching on a large wheels just increases the chances of snapping the center of the wheel from the torque stress being applied to the core of the wheel's hub. They cast a thick, small OD wheels that will give them the lowest rotating mass as possible while providing the highest strength possible.

This guy gets it.