How fast am I going?

Guest

I�m trying to figure out how fast I�m going. I have 15� wheels with 345/40/15 tires on the rear. Obviously the diameter and rolling circumference is way different from stock.
I forgot my physic book, so how do I figure out how fast I�m going, say at 2K, 3K, 4K, 5K and 6K RPM? I believe I have a type 1 gearbox with stock gears and the speedometer seems a bit on the optimistic side.

1/25/0210:45 AM

Original Post

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