Originally Posted by Dominic Toretto
Also consider this about wheel size. It takes a 20inch rim longer to completely rotate than an 18inch wheel respectively. That's why you don't see professional drag racers running huge wheel setups. For those looking to set records, they will not choose a larger wheel, in fact they either go with 18s or SMALLER with a fat DR to hook up with skinny up front.
-Alex
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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.