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Hi. I changed the tires for 245/65 17. Do you think that inflation pressure is correct (29") with the new size?
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I don't believe the system is looking for a specific PSI. I believe it's looking for a difference between tires.However I also agree with staying within 33-35 the TPMS doesn’t know you have different tires and being at 28 could result in TPMS alerts that aren’t needed.
I believe it is based on both weight and volume. The fact that the BS door sill sticker does not change between the offered tire sizes, shows that it is somewhat insensitive. That is also backed up by people being able to run tire pressures in the high 30’s and others in the low 30’s and both are happy and have good tire wear.Tire pressure is based on weight of vehicle. That’s why we monitor pressures and not volume
Ford "fixed" ride quality issues with some early Explorers by recommending lower tire pressure. So low, in fact, it made the vehicles more prone to rollover.There is a post here somewhere from @Falken QA that does say that with larger tires you could run a lower psi but they shy away from recommending a tire pressure less than what Ford specs. I’m sure that is because they don’t want to accept responsibility if something goes wrong.
Let’s be clear here, we are only talking about relatively small changes in air pressure. Like maybe 3-5 psi less than the sill sticker for a larger tire. I don’t think that anyone should be running around on the street with 25 psi air pressure (or less). I think about 30 psi would be the least I would say anyone should run in a 245 wide tire on the BS. That is roughly a 10% change which is about the same change as the increase in tire width (10%).Ford "fixed" ride quality issues with some early Explorers by recommending lower tire pressure. So low, in fact, it made the vehicles more prone to rollover.
Based on what I’m reading here, I would not go all the way to 33 on those. 38 seems correct but I’m not positive which tire and the max psi rating but I was assuming 245/65/17 and max 50 psiI have Mickey Thompson Baja Boss A/Ts and I have no idea. I put them at 38 psi, but y'all are making me question that
I have Mickey Thompson Baja Boss A/Ts and I have no idea. I put them at 38 psi, but y'all are making me question that