18" to 20" require programming for correct speedo?

[07 Denali]

I have 18" OEM wheels on my Denali. Thinking about 20" OEMs and putting snow tires on the 18s. Of course, I will be switching them depending on the season. Do I need to program to correct the speedo for the tire change? Or are the overall diameters of the 18" OEM and 20" OEM tires the same so no programming would be required.

Thanks.

 

[Big Buttons]

That small of a change won't really do anything to your speedo.

 

[07 Denali]

What about 22s?

 

[RotaryMachineRx]

The 20's will have smaller profile tires making the OD of the 18" to 20" nearly the same. Your speedo will not be offset noticeably by this change

---------- Post added at 08:06 AM ---------- Previous post was at 08:01 AM ----------

I'll sell you some 24" Dub Ballers wrapped in Pirelli's that will really spiff up your ride!

PM me if you would be interested; mounted/balanced/TPMS

 

[Keanen55]

What about 22s?

No, your speedometer reading will be fine. You won't have to worry about that until you get 26 or bigger