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Well because for 18" staggered, it's 255/40/18 on 8.5". So for 19", 225/35/19 on 9.0, when I put it in a wheel calculator, the speed is thrown off unless I put it as 255/35/19, which is why I think something is a bit odd.
I also looked at tirerack and filtered down the 19" option and it too saids 255 for the rears.
If you look at the IS-F and highlight the tire that's on there. It saids the car uses a 9.5" wheel for the rear. But looking at the spec info, it saids 9.0 rear.
The IS F has 19x8 and 19x9 with 225/40R19 and 255/35R19 tires (same diameter front and rear).
The RWD ISx50 have smaller diameter front tires than rear, so for 19's they recommend 225/35R19 and 255/35R19.
So yes, the sizes listed in the original post are incorrect.
Is Lexus's recommended tire sizing for the rear suppose to be 255/35/19?
Looks like Lexus site may have it wrong since they have it listed as 225/35/19 but it does not seem to look right...
It is in fact a misprint for the size, however the load range listed is correct. The load range for a 225/35/19 is in fact (88Y) and for a 255/35/19 it is (96Y)