Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
225/60r16 vs 245/45r18 Tire Comparison Side By Side
  225/60-16 245/45-18 Difference
Diameter inches (mm) 26.63 (676.4) 26.68 (677.7) 0.05 (1.3) 0.2%
Width inches (mm) 8.86 (225) 9.65 (245) 0.79 (20) 8.9%
Circum. inches (mm) 83.66 (2124.97) 83.82 (2129.06) 0.16 (4.08) 0.2%
Sidewall Height inches (mm) 5.31 (135) 4.34 (110.25) -0.97 (-24.75) -18.3%
Revolutions per mile (km) 757.35 (470.59) 755.9 (469.69) -1.45 (-0.9) -0.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.04 mph (32.25 km/h)
25 mph (40.23 km/h)25.05 mph (40.31 km/h)
30 mph (48.28 km/h)30.06 mph (48.37 km/h)
35 mph (56.33 km/h)35.07 mph (56.44 km/h)
40 mph (64.37 km/h)40.08 mph (64.5 km/h)
45 mph (72.42 km/h)45.09 mph (72.56 km/h)
50 mph (80.47 km/h)50.1 mph (80.62 km/h)
55 mph (88.51 km/h)55.11 mph (88.68 km/h)
60 mph (96.56 km/h)60.12 mph (96.75 km/h)
65 mph (104.61 km/h)65.12 mph (104.81 km/h)

Gear Ratio / RPMs for New Tire (@ 65 mph)
2.35 2.73 2.94 3.07 3.21 3.31 3.42 3.55 3.73 3.91 4.11 4.27 4.56 4.88 5.13 5.29 5.38 5.71 6.17 7.17
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