This is my belief that a lager tyer size will use the horsepower for higher top end speed and a smaller tyer size wilol use it for acceleration.

However i am after some way to prove this as it has been an ongoing argument with 2 of my friends that are adament that a larger tyre size will reduce rear wheel horspower.

id like to prove it without going down and putting a car on a dyno. and then changing the tyre size