Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
225/35r17 vs 235/45r17 Tire Comparison Side By Side
  225/35-17 235/45-17 Difference
Diameter inches (mm) 23.2 (589.3) 25.33 (643.3) 2.13 (54) 9.2%
Width inches (mm) 8.86 (225) 9.25 (235) 0.39 (10) 4.4%
Circum. inches (mm) 72.89 (1851.34) 79.57 (2020.99) 6.68 (169.65) 9.2%
Sidewall Height inches (mm) 3.1 (78.75) 4.16 (105.75) 1.06 (27) 34.3%
Revolutions per mile (km) 869.29 (540.15) 796.32 (494.81) -72.97 (-45.34) -8.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.83 mph (35.14 km/h)
25 mph (40.23 km/h)27.29 mph (43.92 km/h)
30 mph (48.28 km/h)32.75 mph (52.7 km/h)
35 mph (56.33 km/h)38.21 mph (61.49 km/h)
40 mph (64.37 km/h)43.67 mph (70.27 km/h)
45 mph (72.42 km/h)49.12 mph (79.06 km/h)
50 mph (80.47 km/h)54.58 mph (87.84 km/h)
55 mph (88.51 km/h)60.04 mph (96.63 km/h)
60 mph (96.56 km/h)65.5 mph (105.41 km/h)
65 mph (104.61 km/h)70.96 mph (114.19 km/h)
70 mph (112.65 km/h)76.41 mph (122.98 km/h)
75 mph (120.7 km/h)81.87 mph (131.76 km/h)
80 mph (128.75 km/h)87.33 mph (140.55 km/h)
85 mph (136.79 km/h)92.79 mph (149.33 km/h)
90 mph (144.84 km/h)98.25 mph (158.11 km/h)
95 mph (152.89 km/h)103.71 mph (166.9 km/h)
100 mph (160.93 km/h)109.16 mph (175.68 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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