different tire PSI or different sized tires?

davemsc

Member
:
mazda protege5
Hey all,
have a a 2013 Mazda 3 GS SKY and tit originally came with 205 55 16 tires and the door placard says to inflate at 36PSI

I now have 215 45 17 tires. I know the manual says to inflate the 18s at a different PSI (32) so does that mean I should inflate the 17s at a different PSI other than 36 PSI?

Thanks!
Dave
 
I would start at 34 psi all-around and monitor tread wear. Sometimes there are differences in wear among different brands of same-size tires, even when inflated to the same pressure. That's why I suggest to monitor the wear pattern and adjust accordingly. I like those digital tread depth measurement tools but calipers or even a fine-measurement ruler will work.
 
Back