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 195/45r15 Tire Comparison Side By Side
  205/45-15 195/45-15 Difference
Diameter inches (mm) 22.26 (565.5) 21.91 (556.5) -0.35 (-9) -1.6%
Width inches (mm) 8.07 (205) 7.68 (195) -0.39 (-10) -4.9%
Circum. inches (mm) 69.94 (1776.57) 68.83 (1748.3) -1.11 (-28.27) -1.6%
Sidewall Height inches (mm) 3.63 (92.25) 3.45 (87.75) -0.18 (-4.5) -4.9%
Revolutions per mile (km) 905.87 (562.88) 920.52 (571.98) 14.65 (9.1) 1.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.68 mph (31.67 km/h)
25 mph (40.23 km/h)24.6 mph (39.59 km/h)
30 mph (48.28 km/h)29.52 mph (47.51 km/h)
35 mph (56.33 km/h)34.44 mph (55.43 km/h)
40 mph (64.37 km/h)39.36 mph (63.35 km/h)
45 mph (72.42 km/h)44.28 mph (71.27 km/h)
50 mph (80.47 km/h)49.2 mph (79.19 km/h)
55 mph (88.51 km/h)54.12 mph (87.11 km/h)
60 mph (96.56 km/h)59.05 mph (95.02 km/h)
65 mph (104.61 km/h)63.97 mph (102.94 km/h)
70 mph (112.65 km/h)68.89 mph (110.86 km/h)
75 mph (120.7 km/h)73.81 mph (118.78 km/h)
80 mph (128.75 km/h)78.73 mph (126.7 km/h)
85 mph (136.79 km/h)83.65 mph (134.62 km/h)
90 mph (144.84 km/h)88.57 mph (142.54 km/h)
95 mph (152.89 km/h)93.49 mph (150.45 km/h)
100 mph (160.93 km/h)98.41 mph (158.37 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
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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