They are basically powered by gravity so they should accelerate at the same speed, ramp or no ramp, right?
The acceleration would in the most part be dependant on the ratio of weight to the moment of inertia, since all of those tires had enough grip to not slip. Therefore a tire where the weight would not only be on the rim but closer to the Centre would have lower moment of inertia and could accelerate faster. At the end of the slope the Energy gained from gravitation is divided into kinetic and rotational energy, and again the tire with the more centered weight distribution has an advantage. I'd guess that drag has a smaller influence on the slope, but of course is very important in flight, but again in relation to the weight. So overall a tire with a narrow width and a centric weight distribution with high density should perform best.
An easy way to improve the shown results would be to put the tires on their rims.
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