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@Machine
This image only shows one length, not the full surface. And it is also dependant on tire pressure. I notice that I have less resistance when using 23s compared to 25s, both about the same pressure, though not accurately measured. It also depends on the profile of the tire. However, the ones I've tested were both slick. Then theres the compound of the tire... Well you see where I'm going. I'm no expert but common sense tells me that the best tires are those of personal preference.