Spart
Well-Known Member
Best way to find out is GPS.I want to change my as-built tire diameter hex data value for my Mickey Thompson ET Street S/S 315/35/17 drag radials. When I am at the drag strip I lower the tire pressure to 17psi. I wonder how much additional "squishing" factor there might be over the 96.7% circumference figure Ford is using?
Any ideas on how much additional "squish" factor I should consider with the tires at 17psi or what I should change the hex value to?
Mickey Thompson's website list the diameter as 25.9 inches and circumference as 81.4 inches for this tire. http://www.mickeythompsontires.com/strip/et-street-ss/
Mickey Thompson 315/35/17 website data:
Diameter: 25.9β / 657.859mm
Circumference MT website: 81.4β 2067.56mm
2067 x 0.967 = 1998.789
Hexadecimal Value: 7CE
2067 X βMickey Thompson squish" 0.963 = 1990.521
Hexadecimal Value: 7C6
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