Who knows for sure, I get 35 inches tall equals 2792 mm around (diameter). 5% off of that and I come up with 2652. The best way is to try a number that's close and make adjustments until you are satisfied. The speedo should be 2mph higher than the Gryphon, this is from Ford, cuts down on speeding I guess. Hope this helps some. BTW, I do not like math.
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