What mid west said. The weight matters more than the diameter. Not much but a little. The whole 19" and 20" staggered never made much sense to me. If anything you'd want 20" in the front and 19" in the rear. haha. Adding weight/diameter to anything that rotates with the motor is what hinders performance. Unless you're that anal about .1 -.2 seconds I'd go with the 20s. 1st for tire selection. 2nd for looks.
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