Quote:
Originally Posted by BrianG
macrow: ballooning depends a lot on the tire and the foams used inside. For a tire to balloon out, the sidewalls have to contract and good/harder foams will help limit this. 1" ballooning on a 4.25" tire is a 23.5% increase in tire size! That would make the tires look like pizza cutters and would seriously hamper handling. The calc only show theoretical speed, ot theoretical controllable speed. 
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I'm running
these in the road. And they do look like pizza cutters at full throttle. And handling goes out the window. From the looks of it 1 inch ballooning was a conservative guess. That would only be a half inch expansion all around.