Did you recalibrate the TPMS after you changed tires. You should recalibrate whenever you change or rotate the tires and when you add air to the tires.
The max pressure listed on the tire is just that "max safe pressure", running pressures higher than that may cause the tire to burst. Tire manufactures provide a chart which show for a given load on a tire size what is the recommended pressure range to run the tire. The car manufacturer has determined the optimum pressure to set the tire at based on the load, handling, MPG, comfort and braking distance. This pressure is listed on the driver side door frame. For the tire size 235/65R17 the pressure should be 32 front 30 rear. For the 235/60R18 it is 33 front 30 rear.
The max pressure listed on the tire is just that "max safe pressure", running pressures higher than that may cause the tire to burst. Tire manufactures provide a chart which show for a given load on a tire size what is the recommended pressure range to run the tire. The car manufacturer has determined the optimum pressure to set the tire at based on the load, handling, MPG, comfort and braking distance. This pressure is listed on the driver side door frame. For the tire size 235/65R17 the pressure should be 32 front 30 rear. For the 235/60R18 it is 33 front 30 rear.
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