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I put 245-275/35R19 tires on the stock 19" rims. Should I be using inflation pressures/TPMS settings for OEM 19" summer tires (235-265/40R19 w/ 29psi F/30psi R) or the OEM 20" summer tires (235-265/35R20 w/ 33psi F/33psi R inflation pressures), or maybe run the 20" "comfort" setting which is 30psi F/30psi R?

Are the OEM recommended tire pressures generally higher for 20" rims due to the lower profile tires, specific to the approved tires, or due to the nature of the 20" rims?
 

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I don't think it makes that much of a difference. In fact in my daily driver I overpressure the tires by a couple of PSI so there's less rolling resistance and I get better mpg and I get more tire life. If I am tracking then yes tire pressures matter.
 

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I put 245-275/35R19 tires on the stock 19" rims. Should I be using inflation pressures/TPMS settings for OEM 19" summer tires (235-265/40R19 w/ 29psi F/30psi R) or the OEM 20" summer tires (235-265/35R20 w/ 33psi F/33psi R inflation pressures), or maybe run the 20" "comfort" setting which is 30psi F/30psi R?

Are the OEM recommended tire pressures generally higher for 20" rims due to the lower profile tires, specific to the approved tires, or due to the nature of the 20" rims?
I’d go with the 20” pressures due to the decreased height of the sidewalls.


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