Larger tires then original will turn slower with lower RPM which means that indicated travelled distance will be shorter and indicated fuel consumption will be larger.
Quote:
Originally Posted by Tn Johnny
Yes Happy, according to a guy at 5 star tuning, were i purchased my scw programmer, he said most vehicles after 2014 uses the oem computer to program tire size which affects the speedometer, and the gear ratio is based on the drive shaft rotation not the wheel size. Can't certify that but that's what I was told. It seems to be true with my 2022 e350 as the bigger wheels didn't seem to affect the gear ratio but did definitely affect the speedometer. Now, after using Forscan, my speedometer*is dead on.
I would add, I would be careful too but I'm pretty sure if the oem computer is not compatible with the forscan, it simply will not work and no harm will be done.
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