Measure the diameter of the tires ... then do the math and calculate the ratio based on RPM and speed when you're in the 1:1 gear ... or any gear you know the ratio of.
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Started looking for 379 Peterbilt TC, 24' to 30' box, bumper pull--but ended up w/1999 Liberty Coach conversion of 45' Prevost XLV bus. 1,000sf heated/AC'd race shop w/dump station, 50amp shore pwr where bus parks, 3 NASCAR/ARCA race cars & 26' Bravo trailer.
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