Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
195/45r15 vs 185/55r15 Tire Comparison Side By Side
  195/45-15 185/55-15 Difference
Diameter inches (mm) 21.91 (556.5) 23.01 (584.5) 1.1 (28) 5%
Width inches (mm) 7.68 (195) 7.28 (185) -0.39 (-10) -5.1%
Circum. inches (mm) 68.83 (1748.3) 72.29 (1836.26) 3.46 (87.96) 5%
Sidewall Height inches (mm) 3.45 (87.75) 4.01 (101.75) 0.55 (14) 16%
Revolutions per mile (km) 920.52 (571.98) 876.42 (544.58) -44.1 (-27.4) -4.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.01 mph (33.81 km/h)
25 mph (40.23 km/h)26.26 mph (42.26 km/h)
30 mph (48.28 km/h)31.51 mph (50.71 km/h)
35 mph (56.33 km/h)36.76 mph (59.16 km/h)
40 mph (64.37 km/h)42.01 mph (67.61 km/h)
45 mph (72.42 km/h)47.26 mph (76.06 km/h)
50 mph (80.47 km/h)52.52 mph (84.52 km/h)
55 mph (88.51 km/h)57.77 mph (92.97 km/h)
60 mph (96.56 km/h)63.02 mph (101.42 km/h)
65 mph (104.61 km/h)68.27 mph (109.87 km/h)
70 mph (112.65 km/h)73.52 mph (118.32 km/h)
75 mph (120.7 km/h)78.77 mph (126.77 km/h)
80 mph (128.75 km/h)84.03 mph (135.23 km/h)
85 mph (136.79 km/h)89.28 mph (143.68 km/h)
90 mph (144.84 km/h)94.53 mph (152.13 km/h)
95 mph (152.89 km/h)99.78 mph (160.58 km/h)
100 mph (160.93 km/h)105.03 mph (169.03 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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