It is popular these days to have "wheels" that are as big in diameter as possible and have tires that are as thin as possible. What counts here is the diameter of the tire.
When done properly this "big wheel" style will keep the same diameter of the tire even thou the wheels are much bigger. This will keep the suspension geometry the same and make sure the tires to not hit the wheel wells.
So if the tires are still the same diameter the speed of the car will not be changed.
But if the tires are Bigger then before it is possible that the car would go faster IF it had the power to do so.
And this is the real answer: Since the bigger tire lowered the RPMs of the engine the engine would be lower in its torque band and in reality the car would go Slower!
It's no secret that drivers take care and look after their cars. And they buy all kinds of accessories. One of the most noticeable is the rims. And if they are suddenly crumpled, many drivers rush to buy new ones, but you can have them rebuilt in your garage. Read our free car guides to find out how to refinish aluminum wheels and see that it's easier than it looks.