I have rims that are 215/35/18 (low pro)......what psi should i be at.......i was putting air last time my tires still looked low, when i check the guage it was reading at 60psi............whats the correct/safe psi i should be at..............any help would be appreciated.

 

holy ****!!!! that is way to much air!!!!!!!!!! I usually put 40 all around and 45 when I autocross.

I say put btw 35 and 40. BUt not 60!!!!!!!!!

Dave

 

No matter what size wheels/tires you have, the best place to start is with the pressure recommended for your car (in the owner's manual and on the door jamb or the door of the glove compartment), which is probably in the low thirties. Then adjust from there in 2 psi increments based on treadwear, your preference for ride and handling, etc. Don't set it anywhere near the maximum psi specified on the tire sidewall, and especially not over it (which 60 psi almost certainly is). And don't guess based on appearance; use a good tire pressure gauge.

 

air pressure is determined by the load index of your stock tires versus the load index of your current tires ...for example if you have a load index from a 185-65r14 is 85(1028 lbs) and you load index off of a 215-35r18 is 84(995 lbs) to carry the same air pressure you would have to run 34 psi(1044 lbs) to carry the same load at the right psi

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by vtecsi00 &raquo;</TD></TR><TR><TD CLASS="quote">air pressure is determined by the load index of your stock tires versus the load index of your current tires ...for example if you have a load index from a 185-65r14 is 85(1028 lbs) and you load index off of a 215-35r18 is 84(995 lbs) to carry the same air pressure you would have to run 34 psi(1044 lbs) to carry the same load at the right psi</TD></TR></TABLE>

Absolutely NOT TRUE.

The load index only concerns how much weight the tires can carry, and has absolutely nothing to do with the optimal tire pressure.

 

yes it is that is how you can measure what air pressure to run on a vehicle that has a plus fitment....go any tire dealer that uses a load index chart and that is how they determine the correct pressure to run on a vehicle.....which is based off the air pressure from the factory.....


Modified by vtecsi00 at 12:47 AM 9/19/2006

 

Again, absolutely NOT TRUE. All that does is compare the pressures at the maximum load, which has nothing to do with the optimal pressure for your car.

 

wrong again that does not compare to mazimum load that is from factory air pressure setting at that load range at that air pressure setting to the plus size load range to meet that factory setting to have the correct air pressure in the tire and not over inflating the tire

 

Sorry, but you just don't know what you're talking about. I don't know where you get your crazy ideas from, but you won't find them on any of the best websites for tire information, like the Tire Rack, Discount Tire, tire manufacturers, etc.

Again: The load rating has ABSOLUTELY NOTHING to do with the best tire pressure to use.

 

yes it is and hate to tell you but i do work for one of those company's thaT you listed AND US GUYS AT WORK DON'T THINK YOU GET IT............

 

since i know nothing then tell me what is the correct way to determine the correct air pressure to put in????????????? lets say i have 215/35r18 and my stock size tire is a 195//55r15 and the stock psi is 35 front and 32 rear

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by vtecsi00 &raquo;</TD></TR><TR><TD CLASS="quote">i do work for one of those company's thaT you listed</TD></TR></TABLE>

I don't believe you. Either that, or you're at some podunk Discount Tire store where all the guys have their heads up their behinds (and I've been to some individual stores like that).

I've seen some places claim that you need to increase pressures by as much as 8 psi when you increase the wheel diameter by two inches. That's just total hogwash.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by vtecsi00 &raquo;</TD></TR><TR><TD CLASS="quote">i know nothing</TD></TR></TABLE>



<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by vtecsi00 &raquo;</TD></TR><TR><TD CLASS="quote">tell me what is the correct way to determine the correct air pressure to put in????????????? lets say i have 215/35r18 and my stock size tire is a 195//55r15 and the stock psi is 35 front and 32 rear</TD></TR></TABLE>

Start at 35 front and 32 rear. If your tires wear faster in the middle than along both edges, try reducing pressure by 2 psi; if they wear faster along both edges than in the middle, try increasing pressure by 2 psi. If you want a bit more comfortable ride, try reducing pressure by 2 psi; if you want a bit crisper handling and don't mind a harsher ride, try increasing pressure by 2 psi. You can also adjust pressure differences front vs rear to counteract understeer or oversteer.

 

would have to agree with you on the some dumb guys that work at tire stores and because you put that tire size tire on your car and they want to put 40 or 44 psi in your tires total idiots..............that is what a load index chart is for..is a staring point to help you adj air pressure...and then as you say adjust a couple psi at a time forwards or backwards for your driving habits........in my true which is a 205/50r15 i run 32 psi in front and 30 psi in rear and i love the handling that i get
and my oe air pressure is 35 psi in front and 32 in rear from honda...but my 205/50r15 having a higher load index than my stock tires which gives me that room to play with