The other thing that would make us reccommend more than 35 would be either heavy, or heavily loaded vehicles. So short of moving, (or slowing down) the best solutions to this are more air pressure and consistent rotations. We say minimum because if you drive a lot of twisty roads, your tires will naturally wear more on the edges. We are still not allowed to go lower.Įxamples of air pressure specifications, as found on the door placard and in the owner's manual.īecause of the curvy, hilly roads around here, we generally recommend a minimum of 35 psi for anything but 3/4 ton and 1 ton trucks. Fortunately, they soon realized this, and issued a clarification to the law that they would allow us to put more air in the tires if the customer requested it. So in order to reduce greenhouse emissions caused by underinflated tires, we were required to underinflate them(!?). That's all well and good, we want to decrease greenhouse emissions, but there's a problem, for easily more than half the vehicles we work on, the vehicle manufacturers specifications are either patently too low (for this area), or barely adequate. ![]() It roughly states that: in order to reduce greenhouse emissions caused by underinflated tires, all auto shops are required to set the air pressure in any car they work on to the vehicle manufacturer's specifications (usually found on the door placard). So here are some of the principles we used to determine the answer.Ĭalifornia passed a law in September 2010 concerning air pressure. One of the questions we get asked the most is "What air pressure should I use in my tires?" It is a simple question, but the answer hinges on what you drive, where you drive, and how you drive it.
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