Tire Pressure for 2009 Cadillac STS Base Model.

2009 Cadillac STS Base Model Origial Equipment tire sizes and optional tire sizes. Click on tire size set to see its recommended tire pressure.

235/50R17
2009 Cadillac STS Base Model Tire Pressure

30 psi

2.07 bar or 207 kPa
235/50R17
Front Tire Pressure

30 psi

2.07 bar or 207 kPa
235/50R17
Rear Tire Pressure

2009 Cadillac STS Base Model has original equipment tire size of 235/50R17 for front tires and original equipment tire size of 235/50R17 for rear tires.

2009 Cadillac STS Base Model recommended front tire pressure for 235/50R17 front tires is 30 psi. 2009 Cadillac STS Base Model recommended rear tire pressure for 235/50R17 rear tires is 30 psi.

Check 2009 Cadillac STS Base Model tire load inflation chart for 2009 Cadillac STS Base Model weight and tire load index.

2009 Cadillac STS Base Model tire pressure is affected by changes in atmospheric temperature. Use tire inflation temperature chart below to identify tire pressure fluctuation with changes in temperature in order to adjust tire pressure in 2009 Cadillac STS Base Model tires and maintain it at recommended levels.

Change in Temperature represents the difference between current atmospheric temperature and the one used to set your vehicle's recommended tire pressure. Adjusted Pressure is the actual tire pressure at current temperature change. Pressure Difference shows by how much psi your tires are overinflated or underinflated.

Tire Pressure Temperature Chart | Tire Pressure Temperature Calculator

Front Tire: 235/50R17
Recommended Tire Pressure: 30 psi
Change in Temperature Adjusted Tire Pressure Pressure Difference
+100 °F 38.1 psi +8.1 psi
+95 °F 37.7 psi +7.7 psi
+90 °F 37.29 psi +7.29 psi
+85 °F 36.89 psi +6.89 psi
+80 °F 36.48 psi +6.48 psi
+75 °F 36.08 psi +6.08 psi
+70 °F 35.67 psi +5.67 psi
+65 °F 35.27 psi +5.27 psi
+60 °F 34.86 psi +4.86 psi
+55 °F 34.46 psi +4.46 psi
+50 °F 34.05 psi +4.05 psi
+45 °F 33.65 psi +3.65 psi
+40 °F 33.24 psi +3.24 psi
+35 °F 32.84 psi +2.84 psi
+30 °F 32.43 psi +2.43 psi
+25 °F 32.03 psi +2.03 psi
+20 °F 31.62 psi +1.62 psi
+15 °F 31.22 psi +1.22 psi
+10 °F 30.81 psi +0.81 psi
+5 °F 30.41 psi +0.41 psi
+0 °F 30 psi 0 psi
-5 °F 29.6 psi -0.4 psi
-10 °F 29.19 psi -0.81 psi
-15 °F 28.79 psi -1.21 psi
-20 °F 28.38 psi -1.62 psi
-25 °F 27.98 psi -2.02 psi
-30 °F 27.57 psi -2.43 psi
-35 °F 27.17 psi -2.83 psi
-40 °F 26.76 psi -3.24 psi
-45 °F 26.36 psi -3.64 psi
-50 °F 25.95 psi -4.05 psi
-55 °F 25.55 psi -4.45 psi
-60 °F 25.14 psi -4.86 psi
-65 °F 24.74 psi -5.26 psi
-70 °F 24.33 psi -5.67 psi
-75 °F 23.93 psi -6.07 psi
-80 °F 23.52 psi -6.48 psi
-85 °F 23.12 psi -6.88 psi
-90 °F 22.71 psi -7.29 psi
-95 °F 22.31 psi -7.69 psi
-100 °F 21.9 psi -8.1 psi
Rear Tire: 235/50R17
Recommended Tire Pressure: 30 psi
Change in Temperature Adjusted Tire Pressure Pressure Difference
+100 °F 38.1 psi +8.1 psi
+95 °F 37.7 psi +7.7 psi
+90 °F 37.29 psi +7.29 psi
+85 °F 36.89 psi +6.89 psi
+80 °F 36.48 psi +6.48 psi
+75 °F 36.08 psi +6.08 psi
+70 °F 35.67 psi +5.67 psi
+65 °F 35.27 psi +5.27 psi
+60 °F 34.86 psi +4.86 psi
+55 °F 34.46 psi +4.46 psi
+50 °F 34.05 psi +4.05 psi
+45 °F 33.65 psi +3.65 psi
+40 °F 33.24 psi +3.24 psi
+35 °F 32.84 psi +2.84 psi
+30 °F 32.43 psi +2.43 psi
+25 °F 32.03 psi +2.03 psi
+20 °F 31.62 psi +1.62 psi
+15 °F 31.22 psi +1.22 psi
+10 °F 30.81 psi +0.81 psi
+5 °F 30.41 psi +0.41 psi
+0 °F 30 psi 0 psi
-5 °F 29.6 psi -0.4 psi
-10 °F 29.19 psi -0.81 psi
-15 °F 28.79 psi -1.21 psi
-20 °F 28.38 psi -1.62 psi
-25 °F 27.98 psi -2.02 psi
-30 °F 27.57 psi -2.43 psi
-35 °F 27.17 psi -2.83 psi
-40 °F 26.76 psi -3.24 psi
-45 °F 26.36 psi -3.64 psi
-50 °F 25.95 psi -4.05 psi
-55 °F 25.55 psi -4.45 psi
-60 °F 25.14 psi -4.86 psi
-65 °F 24.74 psi -5.26 psi
-70 °F 24.33 psi -5.67 psi
-75 °F 23.93 psi -6.07 psi
-80 °F 23.52 psi -6.48 psi
-85 °F 23.12 psi -6.88 psi
-90 °F 22.71 psi -7.29 psi
-95 °F 22.31 psi -7.69 psi
-100 °F 21.9 psi -8.1 psi
Front Tire: 235/50R17
Recommended Tire Pressure: 30 psi
Change in Temperature Adjusted Tire Pressure Pressure Difference
+30 °C 34.37 psi +4.37 psi
+29 °C 34.23 psi +4.23 psi
+28 °C 34.08 psi +4.08 psi
+27 °C 33.94 psi +3.94 psi
+26 °C 33.79 psi +3.79 psi
+25 °C 33.65 psi +3.65 psi
+24 °C 33.5 psi +3.5 psi
+23 °C 33.35 psi +3.35 psi
+22 °C 33.21 psi +3.21 psi
+21 °C 33.06 psi +3.06 psi
+20 °C 32.92 psi +2.92 psi
+19 °C 32.77 psi +2.77 psi
+18 °C 32.62 psi +2.62 psi
+17 °C 32.48 psi +2.48 psi
+16 °C 32.33 psi +2.33 psi
+15 °C 32.19 psi +2.19 psi
+14 °C 32.04 psi +2.04 psi
+13 °C 31.9 psi +1.9 psi
+12 °C 31.75 psi +1.75 psi
+11 °C 31.6 psi +1.6 psi
+10 °C 31.46 psi +1.46 psi
+9 °C 31.31 psi +1.31 psi
+8 °C 31.17 psi +1.17 psi
+7 °C 31.02 psi +1.02 psi
+6 °C 30.87 psi +0.87 psi
+5 °C 30.73 psi +0.73 psi
+4 °C 30.58 psi +0.58 psi
+3 °C 30.44 psi +0.44 psi
+2 °C 30.29 psi +0.29 psi
+1 °C 30.15 psi +0.15 psi
+0 °C 30 psi 0 psi
-1 °C 29.85 psi -0.15 psi
-2 °C 29.71 psi -0.29 psi
-3 °C 29.56 psi -0.44 psi
-4 °C 29.42 psi -0.58 psi
-5 °C 29.27 psi -0.73 psi
-6 °C 29.13 psi -0.87 psi
-7 °C 28.98 psi -1.02 psi
-8 °C 28.83 psi -1.17 psi
-9 °C 28.69 psi -1.31 psi
-10 °C 28.54 psi -1.46 psi
-11 °C 28.4 psi -1.6 psi
-12 °C 28.25 psi -1.75 psi
-13 °C 28.1 psi -1.9 psi
-14 °C 27.96 psi -2.04 psi
-15 °C 27.81 psi -2.19 psi
-16 °C 27.67 psi -2.33 psi
-17 °C 27.52 psi -2.48 psi
-18 °C 27.38 psi -2.62 psi
-19 °C 27.23 psi -2.77 psi
-20 °C 27.08 psi -2.92 psi
-21 °C 26.94 psi -3.06 psi
-22 °C 26.79 psi -3.21 psi
-23 °C 26.65 psi -3.35 psi
-24 °C 26.5 psi -3.5 psi
-25 °C 26.36 psi -3.64 psi
-26 °C 26.21 psi -3.79 psi
-27 °C 26.06 psi -3.94 psi
-28 °C 25.92 psi -4.08 psi
-29 °C 25.77 psi -4.23 psi
-30 °C 25.63 psi -4.37 psi
Rear Tire: 235/50R17
Recommended Tire Pressure: 30 psi
Change in Temperature Adjusted Tire Pressure Pressure Difference
+30 °C 34.37 psi +4.37 psi
+29 °C 34.23 psi +4.23 psi
+28 °C 34.08 psi +4.08 psi
+27 °C 33.94 psi +3.94 psi
+26 °C 33.79 psi +3.79 psi
+25 °C 33.65 psi +3.65 psi
+24 °C 33.5 psi +3.5 psi
+23 °C 33.35 psi +3.35 psi
+22 °C 33.21 psi +3.21 psi
+21 °C 33.06 psi +3.06 psi
+20 °C 32.92 psi +2.92 psi
+19 °C 32.77 psi +2.77 psi
+18 °C 32.62 psi +2.62 psi
+17 °C 32.48 psi +2.48 psi
+16 °C 32.33 psi +2.33 psi
+15 °C 32.19 psi +2.19 psi
+14 °C 32.04 psi +2.04 psi
+13 °C 31.9 psi +1.9 psi
+12 °C 31.75 psi +1.75 psi
+11 °C 31.6 psi +1.6 psi
+10 °C 31.46 psi +1.46 psi
+9 °C 31.31 psi +1.31 psi
+8 °C 31.17 psi +1.17 psi
+7 °C 31.02 psi +1.02 psi
+6 °C 30.87 psi +0.87 psi
+5 °C 30.73 psi +0.73 psi
+4 °C 30.58 psi +0.58 psi
+3 °C 30.44 psi +0.44 psi
+2 °C 30.29 psi +0.29 psi
+1 °C 30.15 psi +0.15 psi
+0 °C 30 psi 0 psi
-1 °C 29.85 psi -0.15 psi
-2 °C 29.71 psi -0.29 psi
-3 °C 29.56 psi -0.44 psi
-4 °C 29.42 psi -0.58 psi
-5 °C 29.27 psi -0.73 psi
-6 °C 29.13 psi -0.87 psi
-7 °C 28.98 psi -1.02 psi
-8 °C 28.83 psi -1.17 psi
-9 °C 28.69 psi -1.31 psi
-10 °C 28.54 psi -1.46 psi
-11 °C 28.4 psi -1.6 psi
-12 °C 28.25 psi -1.75 psi
-13 °C 28.1 psi -1.9 psi
-14 °C 27.96 psi -2.04 psi
-15 °C 27.81 psi -2.19 psi
-16 °C 27.67 psi -2.33 psi
-17 °C 27.52 psi -2.48 psi
-18 °C 27.38 psi -2.62 psi
-19 °C 27.23 psi -2.77 psi
-20 °C 27.08 psi -2.92 psi
-21 °C 26.94 psi -3.06 psi
-22 °C 26.79 psi -3.21 psi
-23 °C 26.65 psi -3.35 psi
-24 °C 26.5 psi -3.5 psi
-25 °C 26.36 psi -3.64 psi
-26 °C 26.21 psi -3.79 psi
-27 °C 26.06 psi -3.94 psi
-28 °C 25.92 psi -4.08 psi
-29 °C 25.77 psi -4.23 psi
-30 °C 25.63 psi -4.37 psi

Estimated calculations and should only be taken as suggestions.

2009 Cadillac STS Base Model tire load inflation table provides tire pressure psi values corresponding to tire's weight load in pounds (lbs).

If your vehicle is carrying extra load, increase your tire pressure accordingly. Never overinflate tires above maximum tire pressure indicated on tire sidewall.

If you replace your original equipment tires with plus size tires, or tires with different tire size, make sure to use tire load inflation chart to find corresponding tire pressure for your new tires.

235/50R17
Psi / Load Index
96
26 psi 1201 lbs
27 psi 1235 lbs
28 psi 1257 lbs
29 psi 1312 lbs
30 psi 1367 lbs
31 psi 1378 lbs
32 psi 1411 lbs
33 psi 1466 lbs
34 psi 1488 lbs
35 psi 1510 lbs
36 psi 1565 lbs
37 psi 1565 lbs
38 psi 1565 lbs
39 psi 1565 lbs
40 psi 1565 lbs
41 psi 1565 lbs
42 psi 1565 lbs
F: 235/50R18 - R: 255/45R18
2009 Cadillac STS Base Model Tire Pressure

30 psi

2.07 bar or 207 kPa
235/50R18
Front Tire Pressure

30 psi

2.07 bar or 207 kPa
255/45R18
Rear Tire Pressure

2009 Cadillac STS Base Model has original equipment tire size of 235/50R18 for front tires and original equipment tire size of 255/45R18 for rear tires.

2009 Cadillac STS Base Model recommended front tire pressure for 235/50R18 front tires is 30 psi. 2009 Cadillac STS Base Model recommended rear tire pressure for 255/45R18 rear tires is 30 psi.

Check 2009 Cadillac STS Base Model tire load inflation chart for 2009 Cadillac STS Base Model weight and tire load index.

2009 Cadillac STS Base Model tire pressure is affected by changes in atmospheric temperature. Use tire inflation temperature chart below to identify tire pressure fluctuation with changes in temperature in order to adjust tire pressure in 2009 Cadillac STS Base Model tires and maintain it at recommended levels.

Change in Temperature represents the difference between current atmospheric temperature and the one used to set your vehicle's recommended tire pressure. Adjusted Pressure is the actual tire pressure at current temperature change. Pressure Difference shows by how much psi your tires are overinflated or underinflated.

Tire Pressure Temperature Chart | Tire Pressure Temperature Calculator

Front Tire: 235/50R18
Recommended Tire Pressure: 30 psi
Change in Temperature Adjusted Tire Pressure Pressure Difference
+100 °F 38.1 psi +8.1 psi
+95 °F 37.7 psi +7.7 psi
+90 °F 37.29 psi +7.29 psi
+85 °F 36.89 psi +6.89 psi
+80 °F 36.48 psi +6.48 psi
+75 °F 36.08 psi +6.08 psi
+70 °F 35.67 psi +5.67 psi
+65 °F 35.27 psi +5.27 psi
+60 °F 34.86 psi +4.86 psi
+55 °F 34.46 psi +4.46 psi
+50 °F 34.05 psi +4.05 psi
+45 °F 33.65 psi +3.65 psi
+40 °F 33.24 psi +3.24 psi
+35 °F 32.84 psi +2.84 psi
+30 °F 32.43 psi +2.43 psi
+25 °F 32.03 psi +2.03 psi
+20 °F 31.62 psi +1.62 psi
+15 °F 31.22 psi +1.22 psi
+10 °F 30.81 psi +0.81 psi
+5 °F 30.41 psi +0.41 psi
+0 °F 30 psi 0 psi
-5 °F 29.6 psi -0.4 psi
-10 °F 29.19 psi -0.81 psi
-15 °F 28.79 psi -1.21 psi
-20 °F 28.38 psi -1.62 psi
-25 °F 27.98 psi -2.02 psi
-30 °F 27.57 psi -2.43 psi
-35 °F 27.17 psi -2.83 psi
-40 °F 26.76 psi -3.24 psi
-45 °F 26.36 psi -3.64 psi
-50 °F 25.95 psi -4.05 psi
-55 °F 25.55 psi -4.45 psi
-60 °F 25.14 psi -4.86 psi
-65 °F 24.74 psi -5.26 psi
-70 °F 24.33 psi -5.67 psi
-75 °F 23.93 psi -6.07 psi
-80 °F 23.52 psi -6.48 psi
-85 °F 23.12 psi -6.88 psi
-90 °F 22.71 psi -7.29 psi
-95 °F 22.31 psi -7.69 psi
-100 °F 21.9 psi -8.1 psi
Rear Tire: 255/45R18
Recommended Tire Pressure: 30 psi
Change in Temperature Adjusted Tire Pressure Pressure Difference
+100 °F 38.1 psi +8.1 psi
+95 °F 37.7 psi +7.7 psi
+90 °F 37.29 psi +7.29 psi
+85 °F 36.89 psi +6.89 psi
+80 °F 36.48 psi +6.48 psi
+75 °F 36.08 psi +6.08 psi
+70 °F 35.67 psi +5.67 psi
+65 °F 35.27 psi +5.27 psi
+60 °F 34.86 psi +4.86 psi
+55 °F 34.46 psi +4.46 psi
+50 °F 34.05 psi +4.05 psi
+45 °F 33.65 psi +3.65 psi
+40 °F 33.24 psi +3.24 psi
+35 °F 32.84 psi +2.84 psi
+30 °F 32.43 psi +2.43 psi
+25 °F 32.03 psi +2.03 psi
+20 °F 31.62 psi +1.62 psi
+15 °F 31.22 psi +1.22 psi
+10 °F 30.81 psi +0.81 psi
+5 °F 30.41 psi +0.41 psi
+0 °F 30 psi 0 psi
-5 °F 29.6 psi -0.4 psi
-10 °F 29.19 psi -0.81 psi
-15 °F 28.79 psi -1.21 psi
-20 °F 28.38 psi -1.62 psi
-25 °F 27.98 psi -2.02 psi
-30 °F 27.57 psi -2.43 psi
-35 °F 27.17 psi -2.83 psi
-40 °F 26.76 psi -3.24 psi
-45 °F 26.36 psi -3.64 psi
-50 °F 25.95 psi -4.05 psi
-55 °F 25.55 psi -4.45 psi
-60 °F 25.14 psi -4.86 psi
-65 °F 24.74 psi -5.26 psi
-70 °F 24.33 psi -5.67 psi
-75 °F 23.93 psi -6.07 psi
-80 °F 23.52 psi -6.48 psi
-85 °F 23.12 psi -6.88 psi
-90 °F 22.71 psi -7.29 psi
-95 °F 22.31 psi -7.69 psi
-100 °F 21.9 psi -8.1 psi
Front Tire: 235/50R18
Recommended Tire Pressure: 30 psi
Change in Temperature Adjusted Tire Pressure Pressure Difference
+30 °C 34.37 psi +4.37 psi
+29 °C 34.23 psi +4.23 psi
+28 °C 34.08 psi +4.08 psi
+27 °C 33.94 psi +3.94 psi
+26 °C 33.79 psi +3.79 psi
+25 °C 33.65 psi +3.65 psi
+24 °C 33.5 psi +3.5 psi
+23 °C 33.35 psi +3.35 psi
+22 °C 33.21 psi +3.21 psi
+21 °C 33.06 psi +3.06 psi
+20 °C 32.92 psi +2.92 psi
+19 °C 32.77 psi +2.77 psi
+18 °C 32.62 psi +2.62 psi
+17 °C 32.48 psi +2.48 psi
+16 °C 32.33 psi +2.33 psi
+15 °C 32.19 psi +2.19 psi
+14 °C 32.04 psi +2.04 psi
+13 °C 31.9 psi +1.9 psi
+12 °C 31.75 psi +1.75 psi
+11 °C 31.6 psi +1.6 psi
+10 °C 31.46 psi +1.46 psi
+9 °C 31.31 psi +1.31 psi
+8 °C 31.17 psi +1.17 psi
+7 °C 31.02 psi +1.02 psi
+6 °C 30.87 psi +0.87 psi
+5 °C 30.73 psi +0.73 psi
+4 °C 30.58 psi +0.58 psi
+3 °C 30.44 psi +0.44 psi
+2 °C 30.29 psi +0.29 psi
+1 °C 30.15 psi +0.15 psi
+0 °C 30 psi 0 psi
-1 °C 29.85 psi -0.15 psi
-2 °C 29.71 psi -0.29 psi
-3 °C 29.56 psi -0.44 psi
-4 °C 29.42 psi -0.58 psi
-5 °C 29.27 psi -0.73 psi
-6 °C 29.13 psi -0.87 psi
-7 °C 28.98 psi -1.02 psi
-8 °C 28.83 psi -1.17 psi
-9 °C 28.69 psi -1.31 psi
-10 °C 28.54 psi -1.46 psi
-11 °C 28.4 psi -1.6 psi
-12 °C 28.25 psi -1.75 psi
-13 °C 28.1 psi -1.9 psi
-14 °C 27.96 psi -2.04 psi
-15 °C 27.81 psi -2.19 psi
-16 °C 27.67 psi -2.33 psi
-17 °C 27.52 psi -2.48 psi
-18 °C 27.38 psi -2.62 psi
-19 °C 27.23 psi -2.77 psi
-20 °C 27.08 psi -2.92 psi
-21 °C 26.94 psi -3.06 psi
-22 °C 26.79 psi -3.21 psi
-23 °C 26.65 psi -3.35 psi
-24 °C 26.5 psi -3.5 psi
-25 °C 26.36 psi -3.64 psi
-26 °C 26.21 psi -3.79 psi
-27 °C 26.06 psi -3.94 psi
-28 °C 25.92 psi -4.08 psi
-29 °C 25.77 psi -4.23 psi
-30 °C 25.63 psi -4.37 psi
Rear Tire: 255/45R18
Recommended Tire Pressure: 30 psi
Change in Temperature Adjusted Tire Pressure Pressure Difference
+30 °C 34.37 psi +4.37 psi
+29 °C 34.23 psi +4.23 psi
+28 °C 34.08 psi +4.08 psi
+27 °C 33.94 psi +3.94 psi
+26 °C 33.79 psi +3.79 psi
+25 °C 33.65 psi +3.65 psi
+24 °C 33.5 psi +3.5 psi
+23 °C 33.35 psi +3.35 psi
+22 °C 33.21 psi +3.21 psi
+21 °C 33.06 psi +3.06 psi
+20 °C 32.92 psi +2.92 psi
+19 °C 32.77 psi +2.77 psi
+18 °C 32.62 psi +2.62 psi
+17 °C 32.48 psi +2.48 psi
+16 °C 32.33 psi +2.33 psi
+15 °C 32.19 psi +2.19 psi
+14 °C 32.04 psi +2.04 psi
+13 °C 31.9 psi +1.9 psi
+12 °C 31.75 psi +1.75 psi
+11 °C 31.6 psi +1.6 psi
+10 °C 31.46 psi +1.46 psi
+9 °C 31.31 psi +1.31 psi
+8 °C 31.17 psi +1.17 psi
+7 °C 31.02 psi +1.02 psi
+6 °C 30.87 psi +0.87 psi
+5 °C 30.73 psi +0.73 psi
+4 °C 30.58 psi +0.58 psi
+3 °C 30.44 psi +0.44 psi
+2 °C 30.29 psi +0.29 psi
+1 °C 30.15 psi +0.15 psi
+0 °C 30 psi 0 psi
-1 °C 29.85 psi -0.15 psi
-2 °C 29.71 psi -0.29 psi
-3 °C 29.56 psi -0.44 psi
-4 °C 29.42 psi -0.58 psi
-5 °C 29.27 psi -0.73 psi
-6 °C 29.13 psi -0.87 psi
-7 °C 28.98 psi -1.02 psi
-8 °C 28.83 psi -1.17 psi
-9 °C 28.69 psi -1.31 psi
-10 °C 28.54 psi -1.46 psi
-11 °C 28.4 psi -1.6 psi
-12 °C 28.25 psi -1.75 psi
-13 °C 28.1 psi -1.9 psi
-14 °C 27.96 psi -2.04 psi
-15 °C 27.81 psi -2.19 psi
-16 °C 27.67 psi -2.33 psi
-17 °C 27.52 psi -2.48 psi
-18 °C 27.38 psi -2.62 psi
-19 °C 27.23 psi -2.77 psi
-20 °C 27.08 psi -2.92 psi
-21 °C 26.94 psi -3.06 psi
-22 °C 26.79 psi -3.21 psi
-23 °C 26.65 psi -3.35 psi
-24 °C 26.5 psi -3.5 psi
-25 °C 26.36 psi -3.64 psi
-26 °C 26.21 psi -3.79 psi
-27 °C 26.06 psi -3.94 psi
-28 °C 25.92 psi -4.08 psi
-29 °C 25.77 psi -4.23 psi
-30 °C 25.63 psi -4.37 psi

Estimated calculations and should only be taken as suggestions.

2009 Cadillac STS Base Model tire load inflation table provides tire pressure psi values corresponding to tire's weight load in pounds (lbs).

If your vehicle is carrying extra load, increase your tire pressure accordingly. Never overinflate tires above maximum tire pressure indicated on tire sidewall.

If you replace your original equipment tires with plus size tires, or tires with different tire size, make sure to use tire load inflation chart to find corresponding tire pressure for your new tires.

235/50R18
Psi / Load Index
96
97
101
26 psi 1201 lbs 1235 lbs 1246 lbs
27 psi 1235 lbs 1268 lbs 1279 lbs
28 psi 1257 lbs 1290 lbs 1301 lbs
29 psi 1312 lbs 1345 lbs 1356 lbs
30 psi 1367 lbs 1400 lbs 1400 lbs
31 psi 1378 lbs 1422 lbs 1422 lbs
32 psi 1411 lbs 1455 lbs 1455 lbs
33 psi 1466 lbs 1510 lbs 1510 lbs
34 psi 1488 lbs 1532 lbs 1532 lbs
35 psi 1510 lbs 1554 lbs 1565 lbs
36 psi 1565 lbs 1609 lbs 1620 lbs
37 psi 1565 lbs 1609 lbs 1642 lbs
38 psi 1565 lbs 1609 lbs 1664 lbs
39 psi 1565 lbs 1609 lbs 1720 lbs
40 psi 1565 lbs 1609 lbs 1742 lbs
41 psi 1565 lbs 1609 lbs 1764 lbs
42 psi 1565 lbs 1609 lbs 1819 lbs
255/45R18
Psi / Load Index
99
103
26 psi 1312 lbs 1312 lbs
27 psi 1345 lbs 1356 lbs
28 psi 1367 lbs 1378 lbs
29 psi 1433 lbs 1433 lbs
30 psi 1488 lbs 1488 lbs
31 psi 1510 lbs 1510 lbs
32 psi 1543 lbs 1543 lbs
33 psi 1598 lbs 1598 lbs
34 psi 1620 lbs 1620 lbs
35 psi 1653 lbs 1653 lbs
36 psi 1709 lbs 1709 lbs
37 psi 1709 lbs 1742 lbs
38 psi 1709 lbs 1764 lbs
39 psi 1709 lbs 1819 lbs
40 psi 1709 lbs 1852 lbs
41 psi 1709 lbs 1874 lbs
42 psi 1709 lbs 1929 lbs
255/45R18
2009 Cadillac STS Base Model Tire Pressure

30 psi

2.07 bar or 207 kPa
255/45R18
Front Tire Pressure

30 psi

2.07 bar or 207 kPa
255/45R18
Rear Tire Pressure

2009 Cadillac STS Base Model has original equipment tire size of 255/45R18 for front tires and original equipment tire size of 255/45R18 for rear tires.

2009 Cadillac STS Base Model recommended front tire pressure for 255/45R18 front tires is 30 psi. 2009 Cadillac STS Base Model recommended rear tire pressure for 255/45R18 rear tires is 30 psi.

Check 2009 Cadillac STS Base Model tire load inflation chart for 2009 Cadillac STS Base Model weight and tire load index.

2009 Cadillac STS Base Model tire pressure is affected by changes in atmospheric temperature. Use tire inflation temperature chart below to identify tire pressure fluctuation with changes in temperature in order to adjust tire pressure in 2009 Cadillac STS Base Model tires and maintain it at recommended levels.

Change in Temperature represents the difference between current atmospheric temperature and the one used to set your vehicle's recommended tire pressure. Adjusted Pressure is the actual tire pressure at current temperature change. Pressure Difference shows by how much psi your tires are overinflated or underinflated.

Tire Pressure Temperature Chart | Tire Pressure Temperature Calculator

Front Tire: 255/45R18
Recommended Tire Pressure: 30 psi
Change in Temperature Adjusted Tire Pressure Pressure Difference
+100 °F 38.1 psi +8.1 psi
+95 °F 37.7 psi +7.7 psi
+90 °F 37.29 psi +7.29 psi
+85 °F 36.89 psi +6.89 psi
+80 °F 36.48 psi +6.48 psi
+75 °F 36.08 psi +6.08 psi
+70 °F 35.67 psi +5.67 psi
+65 °F 35.27 psi +5.27 psi
+60 °F 34.86 psi +4.86 psi
+55 °F 34.46 psi +4.46 psi
+50 °F 34.05 psi +4.05 psi
+45 °F 33.65 psi +3.65 psi
+40 °F 33.24 psi +3.24 psi
+35 °F 32.84 psi +2.84 psi
+30 °F 32.43 psi +2.43 psi
+25 °F 32.03 psi +2.03 psi
+20 °F 31.62 psi +1.62 psi
+15 °F 31.22 psi +1.22 psi
+10 °F 30.81 psi +0.81 psi
+5 °F 30.41 psi +0.41 psi
+0 °F 30 psi 0 psi
-5 °F 29.6 psi -0.4 psi
-10 °F 29.19 psi -0.81 psi
-15 °F 28.79 psi -1.21 psi
-20 °F 28.38 psi -1.62 psi
-25 °F 27.98 psi -2.02 psi
-30 °F 27.57 psi -2.43 psi
-35 °F 27.17 psi -2.83 psi
-40 °F 26.76 psi -3.24 psi
-45 °F 26.36 psi -3.64 psi
-50 °F 25.95 psi -4.05 psi
-55 °F 25.55 psi -4.45 psi
-60 °F 25.14 psi -4.86 psi
-65 °F 24.74 psi -5.26 psi
-70 °F 24.33 psi -5.67 psi
-75 °F 23.93 psi -6.07 psi
-80 °F 23.52 psi -6.48 psi
-85 °F 23.12 psi -6.88 psi
-90 °F 22.71 psi -7.29 psi
-95 °F 22.31 psi -7.69 psi
-100 °F 21.9 psi -8.1 psi
Rear Tire: 255/45R18
Recommended Tire Pressure: 30 psi
Change in Temperature Adjusted Tire Pressure Pressure Difference
+100 °F 38.1 psi +8.1 psi
+95 °F 37.7 psi +7.7 psi
+90 °F 37.29 psi +7.29 psi
+85 °F 36.89 psi +6.89 psi
+80 °F 36.48 psi +6.48 psi
+75 °F 36.08 psi +6.08 psi
+70 °F 35.67 psi +5.67 psi
+65 °F 35.27 psi +5.27 psi
+60 °F 34.86 psi +4.86 psi
+55 °F 34.46 psi +4.46 psi
+50 °F 34.05 psi +4.05 psi
+45 °F 33.65 psi +3.65 psi
+40 °F 33.24 psi +3.24 psi
+35 °F 32.84 psi +2.84 psi
+30 °F 32.43 psi +2.43 psi
+25 °F 32.03 psi +2.03 psi
+20 °F 31.62 psi +1.62 psi
+15 °F 31.22 psi +1.22 psi
+10 °F 30.81 psi +0.81 psi
+5 °F 30.41 psi +0.41 psi
+0 °F 30 psi 0 psi
-5 °F 29.6 psi -0.4 psi
-10 °F 29.19 psi -0.81 psi
-15 °F 28.79 psi -1.21 psi
-20 °F 28.38 psi -1.62 psi
-25 °F 27.98 psi -2.02 psi
-30 °F 27.57 psi -2.43 psi
-35 °F 27.17 psi -2.83 psi
-40 °F 26.76 psi -3.24 psi
-45 °F 26.36 psi -3.64 psi
-50 °F 25.95 psi -4.05 psi
-55 °F 25.55 psi -4.45 psi
-60 °F 25.14 psi -4.86 psi
-65 °F 24.74 psi -5.26 psi
-70 °F 24.33 psi -5.67 psi
-75 °F 23.93 psi -6.07 psi
-80 °F 23.52 psi -6.48 psi
-85 °F 23.12 psi -6.88 psi
-90 °F 22.71 psi -7.29 psi
-95 °F 22.31 psi -7.69 psi
-100 °F 21.9 psi -8.1 psi
Front Tire: 255/45R18
Recommended Tire Pressure: 30 psi
Change in Temperature Adjusted Tire Pressure Pressure Difference
+30 °C 34.37 psi +4.37 psi
+29 °C 34.23 psi +4.23 psi
+28 °C 34.08 psi +4.08 psi
+27 °C 33.94 psi +3.94 psi
+26 °C 33.79 psi +3.79 psi
+25 °C 33.65 psi +3.65 psi
+24 °C 33.5 psi +3.5 psi
+23 °C 33.35 psi +3.35 psi
+22 °C 33.21 psi +3.21 psi
+21 °C 33.06 psi +3.06 psi
+20 °C 32.92 psi +2.92 psi
+19 °C 32.77 psi +2.77 psi
+18 °C 32.62 psi +2.62 psi
+17 °C 32.48 psi +2.48 psi
+16 °C 32.33 psi +2.33 psi
+15 °C 32.19 psi +2.19 psi
+14 °C 32.04 psi +2.04 psi
+13 °C 31.9 psi +1.9 psi
+12 °C 31.75 psi +1.75 psi
+11 °C 31.6 psi +1.6 psi
+10 °C 31.46 psi +1.46 psi
+9 °C 31.31 psi +1.31 psi
+8 °C 31.17 psi +1.17 psi
+7 °C 31.02 psi +1.02 psi
+6 °C 30.87 psi +0.87 psi
+5 °C 30.73 psi +0.73 psi
+4 °C 30.58 psi +0.58 psi
+3 °C 30.44 psi +0.44 psi
+2 °C 30.29 psi +0.29 psi
+1 °C 30.15 psi +0.15 psi
+0 °C 30 psi 0 psi
-1 °C 29.85 psi -0.15 psi
-2 °C 29.71 psi -0.29 psi
-3 °C 29.56 psi -0.44 psi
-4 °C 29.42 psi -0.58 psi
-5 °C 29.27 psi -0.73 psi
-6 °C 29.13 psi -0.87 psi
-7 °C 28.98 psi -1.02 psi
-8 °C 28.83 psi -1.17 psi
-9 °C 28.69 psi -1.31 psi
-10 °C 28.54 psi -1.46 psi
-11 °C 28.4 psi -1.6 psi
-12 °C 28.25 psi -1.75 psi
-13 °C 28.1 psi -1.9 psi
-14 °C 27.96 psi -2.04 psi
-15 °C 27.81 psi -2.19 psi
-16 °C 27.67 psi -2.33 psi
-17 °C 27.52 psi -2.48 psi
-18 °C 27.38 psi -2.62 psi
-19 °C 27.23 psi -2.77 psi
-20 °C 27.08 psi -2.92 psi
-21 °C 26.94 psi -3.06 psi
-22 °C 26.79 psi -3.21 psi
-23 °C 26.65 psi -3.35 psi
-24 °C 26.5 psi -3.5 psi
-25 °C 26.36 psi -3.64 psi
-26 °C 26.21 psi -3.79 psi
-27 °C 26.06 psi -3.94 psi
-28 °C 25.92 psi -4.08 psi
-29 °C 25.77 psi -4.23 psi
-30 °C 25.63 psi -4.37 psi
Rear Tire: 255/45R18
Recommended Tire Pressure: 30 psi
Change in Temperature Adjusted Tire Pressure Pressure Difference
+30 °C 34.37 psi +4.37 psi
+29 °C 34.23 psi +4.23 psi
+28 °C 34.08 psi +4.08 psi
+27 °C 33.94 psi +3.94 psi
+26 °C 33.79 psi +3.79 psi
+25 °C 33.65 psi +3.65 psi
+24 °C 33.5 psi +3.5 psi
+23 °C 33.35 psi +3.35 psi
+22 °C 33.21 psi +3.21 psi
+21 °C 33.06 psi +3.06 psi
+20 °C 32.92 psi +2.92 psi
+19 °C 32.77 psi +2.77 psi
+18 °C 32.62 psi +2.62 psi
+17 °C 32.48 psi +2.48 psi
+16 °C 32.33 psi +2.33 psi
+15 °C 32.19 psi +2.19 psi
+14 °C 32.04 psi +2.04 psi
+13 °C 31.9 psi +1.9 psi
+12 °C 31.75 psi +1.75 psi
+11 °C 31.6 psi +1.6 psi
+10 °C 31.46 psi +1.46 psi
+9 °C 31.31 psi +1.31 psi
+8 °C 31.17 psi +1.17 psi
+7 °C 31.02 psi +1.02 psi
+6 °C 30.87 psi +0.87 psi
+5 °C 30.73 psi +0.73 psi
+4 °C 30.58 psi +0.58 psi
+3 °C 30.44 psi +0.44 psi
+2 °C 30.29 psi +0.29 psi
+1 °C 30.15 psi +0.15 psi
+0 °C 30 psi 0 psi
-1 °C 29.85 psi -0.15 psi
-2 °C 29.71 psi -0.29 psi
-3 °C 29.56 psi -0.44 psi
-4 °C 29.42 psi -0.58 psi
-5 °C 29.27 psi -0.73 psi
-6 °C 29.13 psi -0.87 psi
-7 °C 28.98 psi -1.02 psi
-8 °C 28.83 psi -1.17 psi
-9 °C 28.69 psi -1.31 psi
-10 °C 28.54 psi -1.46 psi
-11 °C 28.4 psi -1.6 psi
-12 °C 28.25 psi -1.75 psi
-13 °C 28.1 psi -1.9 psi
-14 °C 27.96 psi -2.04 psi
-15 °C 27.81 psi -2.19 psi
-16 °C 27.67 psi -2.33 psi
-17 °C 27.52 psi -2.48 psi
-18 °C 27.38 psi -2.62 psi
-19 °C 27.23 psi -2.77 psi
-20 °C 27.08 psi -2.92 psi
-21 °C 26.94 psi -3.06 psi
-22 °C 26.79 psi -3.21 psi
-23 °C 26.65 psi -3.35 psi
-24 °C 26.5 psi -3.5 psi
-25 °C 26.36 psi -3.64 psi
-26 °C 26.21 psi -3.79 psi
-27 °C 26.06 psi -3.94 psi
-28 °C 25.92 psi -4.08 psi
-29 °C 25.77 psi -4.23 psi
-30 °C 25.63 psi -4.37 psi

Estimated calculations and should only be taken as suggestions.

2009 Cadillac STS Base Model tire load inflation table provides tire pressure psi values corresponding to tire's weight load in pounds (lbs).

If your vehicle is carrying extra load, increase your tire pressure accordingly. Never overinflate tires above maximum tire pressure indicated on tire sidewall.

If you replace your original equipment tires with plus size tires, or tires with different tire size, make sure to use tire load inflation chart to find corresponding tire pressure for your new tires.

255/45R18
Psi / Load Index
99
103
26 psi 1312 lbs 1312 lbs
27 psi 1345 lbs 1356 lbs
28 psi 1367 lbs 1378 lbs
29 psi 1433 lbs 1433 lbs
30 psi 1488 lbs 1488 lbs
31 psi 1510 lbs 1510 lbs
32 psi 1543 lbs 1543 lbs
33 psi 1598 lbs 1598 lbs
34 psi 1620 lbs 1620 lbs
35 psi 1653 lbs 1653 lbs
36 psi 1709 lbs 1709 lbs
37 psi 1709 lbs 1742 lbs
38 psi 1709 lbs 1764 lbs
39 psi 1709 lbs 1819 lbs
40 psi 1709 lbs 1852 lbs
41 psi 1709 lbs 1874 lbs
42 psi 1709 lbs 1929 lbs
Tire Pressure Tips
  • Recommended tire pressure for 2009 Cadillac STS Base Model tires can be found in vehicle owner’s manual, on sticker placard on driver's door jam, inside glove box compartment or fuel door.
  • It is important to use tire pressure recommended by the vehicle manufacturer, not tire pressure listed on tire sidewall.
  • 2009 Cadillac STS Base Model tires can naturally lose on average 1 to 2 psi of air pressure monthly, so check tire pressure regularly.
  • Check 2009 Cadillac STS Base Model tire pressure when tires are "cold" and have not been driven for at least three hours. Never adjust tire pressure when tires are "hot".
  • 2009 Cadillac STS Base Model tire pressure changes by about 2.5% for each 10°F change in atmospheric temperature. Adjust tire pressure accordingly.
  • Underinflated tires can significantly reduce the life of 2009 Cadillac STS Base Model tires and reduce fuel efficiency by up to 5%.
  • Overinflating 2009 Cadillac STS Base Model tires does not increase their load-carrying capacity. Always use tire inflation value recommended for your vehicle by manufacturer.
  • When replacing original equipment tires for 2009 Cadillac STS Base Model with plus size tires, or tires with different size, check tire load inflation chart to find proper tire pressure for your new tires.
Comments & Discussion (0)

Find Tire Pressure - find recommended tire pressure for your car, light truck, pickup, minivan, crossover, SUV, motorcycle, sports bike, dirt bike or scooter.

Discount Tire Pressure Products - buy discount tire pressure sensors, tire pressure gauges, tire inflators & air compressors, tire pressure monitoring systems (TPMS), tire pressure tools and accessories.

Tire Pressure Forum - tire pressure and tire inflation topics, questions and answers.

Tire Pressure Guide - tire pressure and tire inflation facts, tips and suggestions.

Tire Pressure Charts - tire pressure charts and tire inflation tables.

Tire Pressure Calculators - tire pressure unit conversion, gas savings calculator, tire pressure temperature calculator, and more.

It is important to maintain proper tire pressure for your 2009 Cadillac STS Base Model tires. Low 2009 Cadillac STS Base Model tire pressure can cause tire underinflation, and high 2009 Cadillac STS Base Model tire pressure can cause tire overinflation. Check 2009 Cadillac STS Base Model tire pressure regularly to avoid overinflated and underinflated tires.

Tire inflation value listed on the sidewall of your tire is its maximum tire pressure, and not a recommended 2009 Cadillac STS Base Model tire pressure. Use correct tire inflation listed on 2009 Cadillac STS Base Model tire pressure chart found on a sticker on driver's door jam or in vehicle's manual.

Maintain proper 2009 Cadillac STS Base Model winter tire pressure by adding air to your tires as needed to the recommended tire inflation level.

If your 2009 Cadillac STS Base Model is equipped with tire pressure monitoring system (TPMS), pay attention to low tire pressure warning light being on. Ensure your 2009 Cadillac STS Base Model tire pressure sensors are working properly to stay alert and enjoy a safe ride.

What is recommended 2009 Cadillac STS Base Model tire pressure?
Select 2009 Cadillac STS Base Model tire size to find recommended tire pressure for 2009 Cadillac STS Base Model tires.

Where do I find recommended 2009 Cadillac STS Base Model tire pressure setting?
You can find recommended 2009 Cadillac STS Base Model tire pressure in vehicle owner’s manual, on sticker placard on driver's door jam, inside glove box compartment or fuel door.

How to check 2009 Cadillac STS Base Model tire pressure?
Use a quality tire pressure gauge to check 2009 Cadillac STS Base Model tire pressure to avoid overinflated or underinflated tires.

My 2009 Cadillac STS Base Model low tire pressure light warning is on.
Check 2009 Cadillac STS Base Model tires for low tire pressure. Inflate 2009 Cadillac STS Base Model tires to recommended tire pressure level.

What is proper 2009 Cadillac STS Base Model winter tire pressure?
2009 Cadillac STS Base Model tire inflation will change by about 1 psi for every 10 degrees Fahrenheit change in temperature. Adjust 2009 Cadillac STS Base Model tire pressure to recommended level.