Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
195/45r17 vs 225/45r17 Tire Comparison Side By Side
  195/45-17 225/45-17 Difference
Diameter inches (mm) 23.91 (607.3) 24.97 (634.3) 1.06 (27) 4.4%
Width inches (mm) 7.68 (195) 8.86 (225) 1.18 (30) 15.4%
Circum. inches (mm) 75.11 (1907.89) 78.45 (1992.71) 3.34 (84.82) 4.4%
Sidewall Height inches (mm) 3.45 (87.75) 3.99 (101.25) 0.53 (13.5) 15.4%
Revolutions per mile (km) 843.52 (524.14) 807.61 (501.83) -35.91 (-22.31) -4.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.89 mph (33.62 km/h)
25 mph (40.23 km/h)26.11 mph (42.02 km/h)
30 mph (48.28 km/h)31.33 mph (50.43 km/h)
35 mph (56.33 km/h)36.56 mph (58.83 km/h)
40 mph (64.37 km/h)41.78 mph (67.24 km/h)
45 mph (72.42 km/h)47 mph (75.64 km/h)
50 mph (80.47 km/h)52.22 mph (84.04 km/h)
55 mph (88.51 km/h)57.45 mph (92.45 km/h)
60 mph (96.56 km/h)62.67 mph (100.85 km/h)
65 mph (104.61 km/h)67.89 mph (109.26 km/h)
70 mph (112.65 km/h)73.11 mph (117.66 km/h)
75 mph (120.7 km/h)78.33 mph (126.07 km/h)
80 mph (128.75 km/h)83.56 mph (134.47 km/h)
85 mph (136.79 km/h)88.78 mph (142.88 km/h)
90 mph (144.84 km/h)94 mph (151.28 km/h)
95 mph (152.89 km/h)99.22 mph (159.69 km/h)
100 mph (160.93 km/h)104.45 mph (168.09 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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