PSI and low profile tires
#1
PSI and low profile tires
I just ordered a set of 18" wheels and tires (225/40/18) from tirerack. I saw this warning "XL/RF tires required. Customer must maintain higher tire pressure levels of 42psi for proper load." Is everyone running that high of a PSI on there 18's bigger? I had 18's on my last car and ran them at 38/39 PSI without any problems.
#4
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It would really depend on the load of what is being carried. Manufacturer recommendation isn't always the case.
For instance, my co-worker drives a dodge diesel truck. He does runs under the recommended pressures - the reason being is that because he uses his truck to toe a boat, therefore the extra weight would bring the tire pressures up which is why he lowers it compensate for this. Even if a service shop works on his truck and brings his tire pressures up to the recommended, he will tell them to put it back down because they do not know why it was set that way until after he tells them the reason.
For instance, my co-worker drives a dodge diesel truck. He does runs under the recommended pressures - the reason being is that because he uses his truck to toe a boat, therefore the extra weight would bring the tire pressures up which is why he lowers it compensate for this. Even if a service shop works on his truck and brings his tire pressures up to the recommended, he will tell them to put it back down because they do not know why it was set that way until after he tells them the reason.
Last edited by Sango; 03-24-11 at 04:57 PM.
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#12
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#14
geez, this is an on going arguement, lol. Just came back from getting my 18's put on. (225/40/18). The tire guy told me to go with what lexus recommends on there RWD 18" wheel which is 35psi for tire size 225/40/18. But that seems kinda low to me. IDK, like I said on my last car I ran 38/39 psi with the same tire size. Guess thats what ima go with since I cant find a straight answer