Ready Go
Ram Guru
This may be helpful for anyone using AlfaOBD to correct their speedometer after changing tire sizes from OEM.
The Conversion number to use is...
77.1786833856
Example:
(TireHeight x Conv# = AlfaOBDmm)
31.9" x 77.1786833856 = 2462.00
33.0" x 77.1786833856 = 2546.90
34.1" x 77.1786833856 = 2631.79
34.6" x 77.1786833856 = 2670.38
My understanding is that 2700mm is the approximate limit number for AlfaOBD programming..above which causes problems for OEM "Park Sense" to not function..that equates to a 34.98" tire size. I imagine most tires are fine therefore, other than anyone swapping up to 37s (??).
[I've worked the math on this a couple ways, and it seems to hold true..but not all tire manufacturers hold to the exact heights, etc, so some small adjustments to the mm input number could be needed yet between different brands]
The Conversion number to use is...
77.1786833856
Example:
(TireHeight x Conv# = AlfaOBDmm)
31.9" x 77.1786833856 = 2462.00
33.0" x 77.1786833856 = 2546.90
34.1" x 77.1786833856 = 2631.79
34.6" x 77.1786833856 = 2670.38
My understanding is that 2700mm is the approximate limit number for AlfaOBD programming..above which causes problems for OEM "Park Sense" to not function..that equates to a 34.98" tire size. I imagine most tires are fine therefore, other than anyone swapping up to 37s (??).
[I've worked the math on this a couple ways, and it seems to hold true..but not all tire manufacturers hold to the exact heights, etc, so some small adjustments to the mm input number could be needed yet between different brands]
