Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
145/80r13 vs 165/70r13 Tire Comparison Side By Side
  145/80-13 165/70-13 Difference
Diameter inches (mm) 22.13 (562.2) 22.09 (561.2) -0.04 (-1) -0.2%
Width inches (mm) 5.71 (145) 6.5 (165) 0.79 (20) 13.8%
Circum. inches (mm) 69.54 (1766.2) 69.41 (1763.06) -0.12 (-3.14) -0.2%
Sidewall Height inches (mm) 4.57 (116) 4.55 (115.5) -0.02 (-0.5) -0.4%
Revolutions per mile (km) 911.19 (566.19) 912.81 (567.19) 1.62 (1.01) 0.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.96 mph (32.13 km/h)
25 mph (40.23 km/h)24.96 mph (40.16 km/h)
30 mph (48.28 km/h)29.95 mph (48.19 km/h)
35 mph (56.33 km/h)34.94 mph (56.23 km/h)
40 mph (64.37 km/h)39.93 mph (64.26 km/h)
45 mph (72.42 km/h)44.92 mph (72.29 km/h)
50 mph (80.47 km/h)49.91 mph (80.32 km/h)
55 mph (88.51 km/h)54.9 mph (88.36 km/h)
60 mph (96.56 km/h)59.89 mph (96.39 km/h)
65 mph (104.61 km/h)64.88 mph (104.42 km/h)
70 mph (112.65 km/h)69.88 mph (112.45 km/h)
75 mph (120.7 km/h)74.87 mph (120.49 km/h)
80 mph (128.75 km/h)79.86 mph (128.52 km/h)
85 mph (136.79 km/h)84.85 mph (136.55 km/h)
90 mph (144.84 km/h)89.84 mph (144.58 km/h)
95 mph (152.89 km/h)94.83 mph (152.62 km/h)
100 mph (160.93 km/h)99.82 mph (160.65 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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