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Ok I dug up a very useful equation from a subject i did at uni about solar cars. Its to work out the power requirement at the wheel at any given speed. The blue side gives you the power needed to overcome rolling resistance and the pink is aerodynamic drag, Crr is Coefficient of rolling resistance Cd is coefficient of drag, A is frontal area (sq m), ρ is the density of air (~1.2kg/cubic m) and v is the speed (m/s). So if you have an intended maximum speed you can use this equation to work out the power you will need to achieve it (+transmission losses). I don't know where you find out your Crr but I think the tyre manufacturer should list it somewhere. Enjoy!
 

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