Why did you go with 255/70’s in the first place? Seems like a 275/65 would have also fit? Just curious.
If you want to keep your stock 18’s a 285/65 is dimensionally identical to a 285/70/17. But I get wanting to go to 17’s and especially 285/70’s. Tons of tire choices.
I went with the 255’s day one because we always put an AT on our new vehicles right away. The 255’s fit without issue and provided a beefier look without rubbing and without impacting fuel economy more than a few percent. At first I wasn’t convinced that this vehicle would end up in full build mode to begin with so this was a safe and cheap bet for the time being.
Once I decided that the build would move forward I knew I’d want larger tires than the 255’s and the stock wheels would need spacers to get proper spacing from the UCA with 285’s and I am not a fan of wheel spacers. I already had a set of SCS SR8 wheels and 285/70 Nitto Ridge Grapplers in the garage that I had originally purchased for the 4Runner we owned prior to the GX, it’s a no brainer to move over to those versus buying something else. I do wish that they were 295’s or 285/75’s instead, but again I wasn’t going to let these go to waste and I would almost certainly need to regear with either of those larger sizes and that’s just not in the budget at the moment along with everything else coming.
I don’t mind the 18” wheel size, it’s actually a good compromise between the 17” and 20” but there are more options and better prices in the 17” sizes and again I already had them in my possession. I’ll reevaluate the tires in another year or more and at that point I’ll know whether or not I want to go bigger and invest in regearing and a rear locker at the same time.