Hello all, I drive a 2018 IS350 F-Sport AWD & I was curious what the max acceptable tire size difference is for AWD? Currently I have driven ~150 miles on 255/30/19 rear and 235/35/19 front, which is about a 0.4-0.5 difference in diameter. I haven't noticed anything weird, but I am putting on 225/35/19 on the front tomorrow to make it about a 0.18 inch difference. This is about a 0.7% difference. Is this within the acceptable range? I wanted to avoid modifying my fender liners in the rear (on RSR downs), so that is why I do not want to go with a 265/30/19 in the rear. Thank you all!

 

Ive been running 235-35/265/30/19 on my AWD for 8 years with no trouble. I believe you can be up to 2% before running into trouble

 

Oh okay, thank you. Now I'm not sure if it was worth buying new front tires