Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
205/45r15 vs 205/40r17 Tire Comparison Side By Side
  205/45-15 205/40-17 Difference
Diameter inches (mm) 22.26 (565.5) 23.46 (595.8) 1.19 (30.3) 5.4%
Width inches (mm) 8.07 (205) 8.07 (205) 0 (0) 0%
Circum. inches (mm) 69.94 (1776.57) 73.69 (1871.76) 3.75 (95.19) 5.4%
Sidewall Height inches (mm) 3.63 (92.25) 3.23 (82) -0.4 (-10.25) -11.1%
Revolutions per mile (km) 905.87 (562.88) 859.8 (534.26) -46.07 (-28.63) -5.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.07 mph (33.91 km/h)
25 mph (40.23 km/h)26.34 mph (42.39 km/h)
30 mph (48.28 km/h)31.61 mph (50.87 km/h)
35 mph (56.33 km/h)36.88 mph (59.35 km/h)
40 mph (64.37 km/h)42.14 mph (67.82 km/h)
45 mph (72.42 km/h)47.41 mph (76.3 km/h)
50 mph (80.47 km/h)52.68 mph (84.78 km/h)
55 mph (88.51 km/h)57.95 mph (93.26 km/h)
60 mph (96.56 km/h)63.21 mph (101.73 km/h)
65 mph (104.61 km/h)68.48 mph (110.21 km/h)
70 mph (112.65 km/h)73.75 mph (118.69 km/h)
75 mph (120.7 km/h)79.02 mph (127.17 km/h)
80 mph (128.75 km/h)84.29 mph (135.65 km/h)
85 mph (136.79 km/h)89.55 mph (144.12 km/h)
90 mph (144.84 km/h)94.82 mph (152.6 km/h)
95 mph (152.89 km/h)100.09 mph (161.08 km/h)
100 mph (160.93 km/h)105.36 mph (169.56 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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