Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
245/75r16.5 vs 31/10.5r16 Tire Comparison Side By Side
  245/75-16.5 31/10.5-16 Difference
Diameter inches (mm) 30.97 (786.6) 30.93 (785.54) -0.04 (-1.06) -0.1%
Width inches (mm) 9.65 (245) 10.51 (267) 0.87 (22) 9%
Circum. inches (mm) 97.29 (2471.18) 97.16 (2467.85) -0.13 (-3.33) -0.1%
Sidewall Height inches (mm) 7.23 (183.75) 7.46 (189.57) 0.23 (5.82) 3.2%
Revolutions per mile (km) 651.25 (404.66) 652.12 (405.21) 0.88 (0.55) 0.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.97 mph (32.14 km/h)
25 mph (40.23 km/h)24.97 mph (40.18 km/h)
30 mph (48.28 km/h)29.96 mph (48.22 km/h)
35 mph (56.33 km/h)34.95 mph (56.25 km/h)
40 mph (64.37 km/h)39.95 mph (64.29 km/h)
45 mph (72.42 km/h)44.94 mph (72.32 km/h)
50 mph (80.47 km/h)49.93 mph (80.36 km/h)
55 mph (88.51 km/h)54.93 mph (88.39 km/h)
60 mph (96.56 km/h)59.92 mph (96.43 km/h)
65 mph (104.61 km/h)64.91 mph (104.47 km/h)
70 mph (112.65 km/h)69.91 mph (112.5 km/h)
75 mph (120.7 km/h)74.9 mph (120.54 km/h)
80 mph (128.75 km/h)79.89 mph (128.57 km/h)
85 mph (136.79 km/h)84.89 mph (136.61 km/h)
90 mph (144.84 km/h)89.88 mph (144.65 km/h)
95 mph (152.89 km/h)94.87 mph (152.68 km/h)
100 mph (160.93 km/h)99.87 mph (160.72 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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