My Super Max wheel has the number "65" molded on it and I have yet to detect any difference in speed. The speedometer, like the fuel gauge, still lie. They are in cahoots. Go with what they have. My dealer has offered on numerous occasions to adjust the speedometer to reflect reality and I have refused. It is not important to me. What's behind me is not important, either.
What's your mileage? Who cares. Is it practical? See #1. What happens when it rains? You get wet.
