Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
195/55r13 vs 195/55r20 Tire Comparison Side By Side
  195/55-13 195/55-20 Difference
Diameter inches (mm) 21.44 (544.7) 28.44 (722.5) 7 (177.8) 32.6%
Width inches (mm) 7.68 (195) 7.68 (195) 0 (0) 0%
Circum. inches (mm) 67.37 (1711.23) 89.36 (2269.8) 21.99 (558.58) 32.6%
Sidewall Height inches (mm) 4.22 (107.25) 4.22 (107.25) 0 (0) 0%
Revolutions per mile (km) 940.46 (584.38) 709.02 (440.57) -231.44 (-143.81) -24.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)26.53 mph (42.69 km/h)
25 mph (40.23 km/h)33.16 mph (53.37 km/h)
30 mph (48.28 km/h)39.79 mph (64.04 km/h)
35 mph (56.33 km/h)46.42 mph (74.71 km/h)
40 mph (64.37 km/h)53.06 mph (85.39 km/h)
45 mph (72.42 km/h)59.69 mph (96.06 km/h)
50 mph (80.47 km/h)66.32 mph (106.73 km/h)
55 mph (88.51 km/h)72.95 mph (117.41 km/h)
60 mph (96.56 km/h)79.59 mph (128.08 km/h)
65 mph (104.61 km/h)86.22 mph (138.75 km/h)
70 mph (112.65 km/h)92.85 mph (149.43 km/h)
75 mph (120.7 km/h)99.48 mph (160.1 km/h)
80 mph (128.75 km/h)106.11 mph (170.77 km/h)
85 mph (136.79 km/h)112.75 mph (181.45 km/h)
90 mph (144.84 km/h)119.38 mph (192.12 km/h)
95 mph (152.89 km/h)126.01 mph (202.79 km/h)
100 mph (160.93 km/h)132.64 mph (213.47 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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