I have a AWD G sedan, I just threw on some 18x9 +5 with 215/40/18 and 18x10 et0 with 235/40/18.

I know theres a calculation to measure if those are under the 3 or 5% but I still quite find the right answer. My AWD light is flashing....

What tire size can I run to be under the 3 or 5% if it is way off?

OR is there a way to turn off the AWD system (pulling fuse or anything) to stop having the AWD system turn on?

thanks!

 

No, there is no way to disable your AWD system.

Your fronts are 24.77165" tall
Your rears are 25.40157" tall
You are .62992" out of whack. Over 5/8"

I ran staggered on my AWD Lexus IS with zero problem, BUT I was also in the operable range of conflicting tire heights.

I kept the tires within .2" and it was fine.

What type of tires are you looking for? I'm an old fart at 42 and run nothing but long lasting all season tires, and drive the part too. I would suggest a trip to Tire Rack, find the tire you want to run, and check the specs. It lists ALL the sizes and heights, along with suggested rim widths.

Standard tire height formula:
section width TIMES aspect ratio DIVIDED BY 25.4 TIMES 2 PLUS rim size EQUALS tire height.
In other words:
215 x .4 / 25.4 x 2 + 18 = 24.77165

My main question would be why are you trying to put such skinny tires on such wide wheels?


Jack

 

If you wanted staggered wheels and no AWD, wouldn't an S made more sense than an x?

Even if you keep the tires within .2, it won't be that way for long, as fronts wear quicker than rears. It's not worth putting the additional stress on the AWD system to run staggered wheels. The AWD light is coming on as it is sensing that stress and letting you know something is wrong.

 

Front tire diameter would be 24.8, rears 25.4. That's a bit off to keep the awd system happy over time. Need to find tires that have the same outside diameter front/rear to avoid damage.