Ronzuki
South Central PA
- :
- 2018 CX5 Touring
- :
- w/ Pref Pkg
That would be OK for the AWD aspects, but it would change the measured speed (speedo) and the Odometer elapsed mileage.
It's going to affect a whole lot more than that...all of the automation requires known ratios for wheel speed...you're thinking of the speedo being the primary concern as in pre-techno-marvels days. There's absolutely no way for the common owner knowing what effects changing tire sizes would have upon the numerous control algos. I can almost guarantee that 'exception' wasn't handled in the OEM's programming (software? firmware?). Tire size changes had barely been considered on JK models of Jeep Wranglers, when nearly everyone changes (increases) tire sizes, and many also alter the R&P ratios. Dealers eventually could recal tire size, only to a point. It would sorta correct speedo, no clue regarding any of the other systems reactions. The '04 TJ Rubicon I had was off, brand new from the factory. They never installed the correct speedo gear for the 4:1 transfer case. Clocked on more miles than actually driven, which good for them, caused warranty to expire sooner than it should have, or would have, had it been a standard model TJ.
...dumb to have such a discrepancy in tire diameter when the spare cavity is clearly designed to accommodate the correct diameter.
Repeat....build dollars for added techno-BS has to come from somewhere...