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@umop3pisdn
At a certain point you have to factor in aerodynamics into the equation, which is a whole other variable.
Supersonic and VF Record could be evenly matched in terms of pure speed at 30mph, but that could be due to SS having higher Crr and lower CdA, with the opposite being true for the VF.
Then you have to consider the relationship between tyre and wheel, tyre A might be faster than tyre B on one wheel, but slower on another.
Conti claim the GP4000s is super aero and Specialized reckon the Turbo Cotton is similar, but you'd have to be able to test at such a small resolution to tell the difference.