The SC300 came stock with 16" rims and the sticker in the glovebox says that the cold tire pressure is supposed to be at 32 psi. My SC has 17" rims since the time of purchase. Do I follow the recommendation of the sticker sticker in the glovebox or the recommendation on the sidewall of the R17 tire (which is no where to be found, except for a max 50 psi)?

 

Since your tires are probably not XL(Extra load) You can go with the recommended or 1-2 higher if the tire sidewall got thinner.

 

Got it, thanks! My tire cold tire pressure was 26, and the recommended is 32. I'm gonna go fill up tonight.

 

If the upsize was done correctly the volume of air in the tire should be about the same so the pressure would be the same. +1-2 PSI not a bad idea b/c it is a lower profile tire. Almost never would one inflate to the max inflation pressure on the sidewall of the tire.