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Old 10-03-2016, 06:35 PM   #7
nextcar
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With tires as wide as that in the front you may like the feel a little better if you bump the front tires to 38-40 PSI for the street, while keeping the rears at 35 PSI.

Note that Toyota USA biases the front tires to 38 PSI with the wider TRD 18 inch wheels/tires.

Note also that if you vary the tire pressure front/rear by over 5 PSI you may trip the TPMS system.

Hot and cold inflation pressures have nothing to do with weather variances! As you drive the tires heat up due to friction. The cold inflation values are generally taken as not having driven more than 15 minutes in the last hour or so!!! If you want a true "cold pressure" check your tires after the car has been parked overnight. Once you drive a couple miles at freeway speeds you will get hot pressure readings, not cold.

In the end, as others have stated the numbers on the tire are the absolute MAX safe pressure. The suggested tire pressures on the door jamb apply to the stock wheel size and tire size - the "correct" pressure is the result of the car's weight and the size (width) of the tire. There is room for adjustment due to personal taste (within reason) as well as very different guidelines for racing applications. Once you changed the wheel and tire size, the suggested tire pressures no longer specifically apply but are a reasonable starting point for experimentation. Monitor your tire wear patterns and adjust your pressure accordingly.


Last edited by nextcar; 10-03-2016 at 06:55 PM.
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