Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
215/80r16 vs 245/70r16 Tire Comparison Side By Side
  215/80-16 245/70-16 Difference
Diameter inches (mm) 29.54 (750.4) 29.5 (749.4) -0.04 (-1) -0.1%
Width inches (mm) 8.46 (215) 9.65 (245) 1.18 (30) 14%
Circum. inches (mm) 92.81 (2357.45) 92.69 (2354.31) -0.12 (-3.14) -0.1%
Sidewall Height inches (mm) 6.77 (172) 6.75 (171.5) -0.02 (-0.5) -0.3%
Revolutions per mile (km) 682.66 (424.19) 683.57 (424.75) 0.91 (0.57) 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 (88.4 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 (128.58 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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