After doing some heavy research and not any clear answers on exactly why it isn't run other than "why risk it ?"
If you run on EVO X GSR
18x9.5 +12 offset with 245/40r 18 front
10x10.5 +12 offset with 245/40r 18 rear

the tire height of each wheel keeps at 25.7 in tall and the Revs per Mile at 785.

Now fitting a narrower wheel on the same tire will affect the sidewall which then will affect the grip of the setup. My question does the AWD system sense the Rev per mile and does running this wheel setup allow the 4ws not to freak out and throw the 4ws service required Light. There are some cars that run the staggered setup, especially in time attack and some autocross groups.

I have searched extensively and haven't found a clear answer within the forum as well. any help?

 

Hello @Bobby_RHD
In my mind a staggered EvO setup would be this & is generally thought of as OK:
18x10.5 +22 offset with 245/40r 18 front
10x10.5 +38 offset with 245/40r 18 rear

Dont like the look of this: (diff wheel widths)
18x9.5 +12 offset with 245/40r 18 front
10x10.5 +12 offset with 245/40r 18 rear

Also, regarding that +12 in the rear w/the 10.5, pretty sure this is wide body territory on the X

 

thanks boss , yeah I’m planning on wide-body down the road. My concern is the 9.5 in front and 10.5 diameter differences. I’m just making the best of situation . I have set of wheels I’d like to repurpose but this is Awd damn car is so sensitive. While I wait for the sale I figured I ask for maybe a glimmer of hope to save them.

 

Hey, thats just my opinion. Lets see if there are other opinions from the gents