<TABLE><TBODY><TR><TD vAlign=top width="100%">i just bought nitto 325 65r 18 tires and i put them on my stock ford 18x8 rims and they reccomend a 9 inch wheel size at least for the tires. i just left the ford dealer for a service and they inflated my tires to 65 in the front and 75 in the rear and i yelled at them b/c the max is 50, but the ride was a little better. Can i run my tires at a higher psi to make up for the rims being to small or will they blow up on me
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I am running 50psi in my toyo mt 35x12.50x18 and they seem to be allright.That is what the put in at the tire shop.

 

they put them at about 50 psi at the shop

 

I called toyo and they said 55 front and 60 rear.

35x12.50x18 on 9" wide wheels.

 

really, i guess i should give nitto a call huh. do you notice any difference in the ride with a little more air in them

 

325/65R18's should be run at 45 PSI front and 50 PSI in the rear. If you are not towing/hauling and just daily driving the rears would be better set at 40 PSI. Do not inflate your tires above the max PSI listed on the sidewall. You have to be especially careful not to have more air in your tires than needed. As you know running 325's on stock 8" rims will natrually cause the tire to crown as the tires are too wide for the rim and too much air will just make it worse causing the centers of the tread to wear out even faster.

Here is the load/inflation table for 325/65R18...

65 PSI - 3860#
60 PSI - 3600#
55 PSI - 3390#
50 PSI - 3195#
45 PSI - 2945#
40 PSI - 2715#
35 PSI - 2535#


For those of you who are running 35X12.50R18 they should be run at 50 PSI front and 60 PSI rear. If your not towing/hauling and just daily driving the rears are better set at 45 PSI. I have been running my 35X12.50R18's at 50 PSI front and 45 PSI rear for over 7K now and they are wearing completely evenly across the tread and the ride is perfect.

Here is the load/inflation table for 35X12.50R18...

65 PSI - 3415#
60 PSI - 3220#
55 PSI - 3030#
50 PSI - 2910#
45 PSI - 2735#
40 PSI - 2530#
35 PSI - 2335#
30 PSI - 2075#
25 PSI - 1820#

All load/inflation information is accurate only for that particular size and only up to the max PSI listed on the sidewall.