Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
195/40r14 vs 205/45r17 Tire Comparison Side By Side
  195/40-14 205/45-17 Difference
Diameter inches (mm) 20.14 (511.6) 24.26 (616.3) 4.12 (104.7) 20.5%
Width inches (mm) 7.68 (195) 8.07 (205) 0.39 (10) 5.1%
Circum. inches (mm) 63.28 (1607.24) 76.23 (1936.16) 12.95 (328.92) 20.5%
Sidewall Height inches (mm) 3.07 (78) 3.63 (92.25) 0.56 (14.25) 18.3%
Revolutions per mile (km) 1001.31 (622.18) 831.2 (516.48) -170.11 (-105.7) -17%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)24.09 mph (38.77 km/h)
25 mph (40.23 km/h)30.12 mph (48.47 km/h)
30 mph (48.28 km/h)36.14 mph (58.16 km/h)
35 mph (56.33 km/h)42.16 mph (67.85 km/h)
40 mph (64.37 km/h)48.19 mph (77.55 km/h)
45 mph (72.42 km/h)54.21 mph (87.24 km/h)
50 mph (80.47 km/h)60.23 mph (96.94 km/h)
55 mph (88.51 km/h)66.26 mph (106.63 km/h)
60 mph (96.56 km/h)72.28 mph (116.32 km/h)
65 mph (104.61 km/h)78.3 mph (126.02 km/h)
70 mph (112.65 km/h)84.33 mph (135.71 km/h)
75 mph (120.7 km/h)90.35 mph (145.4 km/h)
80 mph (128.75 km/h)96.37 mph (155.1 km/h)
85 mph (136.79 km/h)102.4 mph (164.79 km/h)
90 mph (144.84 km/h)108.42 mph (174.48 km/h)
95 mph (152.89 km/h)114.44 mph (184.18 km/h)
100 mph (160.93 km/h)120.47 mph (193.87 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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