I can't get a good answer out of Scion about this. It seems to me if they're a port option, they ought to know what pressure they should be set at. (17" Enkei wheels)

Thanks,
JC

 

I always read what the tire says on the sidewall and keep it 2-4psi lower than max. It's less rolling resistance, but it's a little stiffer ride. But, I'd wanna protect my wheels as much as possible if I were running a 40 series tire.

 

I have those rims and I normally run about 32 PSI. I have approximately 38000 on Pirelli P7000 Supersports and they are worn evenly.