^^^ ISF spare is an 18" rim with tall profile tire so its the same tire rolling diameter like people have said.

 

is this is the same for AWD? or are you guys talking about RWD cars only? Because I ran into this issue a while back and had to tow my car because i thought 17 was too small and would spin faster than the other tires on my AWD IS

 

The rolling diameter of the tire is what matters, being that you are on after market rims and tires Im not sure if your spare would still fall under % rolling diameter difference tolerance for AWD front to back.