how is everybody doing? Just wondering I have to take my Magnum in for service and I recently put 20 in tires on and also added the Power Programmer. My question is since I have installed the programmer and changed the rim size I changed the settings on my programmer. Now that is in need of service everything must be put back to stock or the programmer will no longer work.
I need to know the overall tire diameter of the stock rims on an R/T 225/60/18. I appreciate any help. Thanks

 

when i measured my conti tires on my magnum, they were 28"
for some reason, the flashpaq was preset at 27"

 

Theoretically:

22.5 x .60 = 13.5 cm x 2 (top and bottom) = 27 cm (10.6 ") + 18" wheel comes to 28.6 inches overall.....assuming your 225 tire is 225 wide and round.

Is my math ok?