so i have a set of 18's 225 40 18 and was wondering what should the air pressure be set at??? for the front and rear? cause i know with the 17's it was like 29 lbs in the back and 32 in the front??

 

im running 37-40 on mine.

 

i stay at 38 on mine

 

wow reallY? y so much more????? i think when i got them put on the rims the guy put 35 all around

 

i'll take the stiffer ride for less of a chance of damaging my rims.

 

plus with a little more air they handle better at *ahem* higher speeds.

 

Max air pressure has always been printed on the sidewall. That is a good starting point, but most will inflate 10-15% less than max.

 

oh reallY? hmm thanks man ya definately makes sense then alright soo put like 38 in the n all around??

 

my Toyo's say 50psi max.

 

alright good times, ya i havent checked mine to see whats the max. i just dont want my tires to get screwed up if i put more air in.. so like 38 -40?? any more in the front than back? or same all around

 

you probably dont want max on a hot sunny day. they can expand while sitting.

 

Anything below the max sidewall pressure (but above OEM specs) is fine. I don't know what the OEM specs for 18"ers are, though, sorry.

Personally, I run 40/39... on the OEM 17"ers. I'd probably do the same if I had 18s. Saves gas, and improves handling - but I haven't really pushed my car to the limits, so I guess I can't qualify that statement with personal experiences.

However, I have friends who have done it and report both of the above. I can, however, personally attest to the MPG savings. I got 29 MPG (ALL city!) last last tank :D. The only thing that changed was that I continued to mature my gas-saving driving... and only upped my tire pressures that fill.

Also, if you can't do your tires because you can't find someone to pump them, just use a hand bicycle tire pump. No, I'm not kidding. It works 100% ok, and no gas, electricty, etc is needed at all.

I've even pumped the spare from a shocking low 38 PSI all the way to the proper 60 PSI using a hand pump so don't tell me its only good for minor adjustments either

 

On the xB I run 35 psi on the 18's

 

I RUN 38 ON MINE :]

 

I'd love to know how high you can safely go on the 18's without causing wear issues down the center of the tires.

 

you can use anything under the maximum number printed on the side of the tire but its best to use the number recommended by toyota which is printed on the side when you open the door. be sure to check the pressure when its cold.