Do big tires go faster on a car?
The larger tires would actually go slower, as you would have
less revolutions over a distance than the smaller tires.
As far the performance of the vehicle, theoretically, if the
rear end gears remained the same, the car would have a higher
overall top speed with the larger tires... however, that's before
you factor in the higher drag coefficient, decreased
power-to-weight ratio caused by the heavier wheels and tires, and
also where the engine's power band is.