That's cuz we are talking about
real tuning software
not Gryphon for Gassers. AE has a tire size adjustment under the ABS PCM diagnostics.... Minotaur has settings for Revolutions per mile... that value is available in the specs from the tire manufacturer for my new tires is 634... also a pulse per revolution of the speed sensor. its snowing and dark now so may wait on playing with it till later