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Cant figure out why the tire size is this high. Shifting and speedo are accurate, but if i put in 25.6 for a 275/35/18 then all is wrong. I have no idea where this number came from. Anyone have any idea?
Best i can figure this is close to the circumference. 87.48/3.14 =27.85 tire hieght. 25.6 tire would be 80.38 Maybe it has something to do with the new updates to HP Tuners. I haven't tried changing the tire size on any other vehicle to test.
08-06-2016, 09:06 AM
99 c5 tire size current says 87.48? 
