Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
225/60r18 vs 245/60r17 Tire Comparison Side By Side
  225/60-18 245/60-17 Difference
Diameter inches (mm) 28.63 (727.2) 28.57 (725.8) -0.06 (-1.4) -0.2%
Width inches (mm) 8.86 (225) 9.65 (245) 0.79 (20) 8.9%
Circum. inches (mm) 89.94 (2284.57) 89.77 (2280.17) -0.17 (-4.4) -0.2%
Sidewall Height inches (mm) 5.31 (135) 5.79 (147) 0.47 (12) 8.9%
Revolutions per mile (km) 704.44 (437.72) 705.8 (438.56) 1.36 (0.84) 0.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.96 mph (32.12 km/h)
25 mph (40.23 km/h)24.95 mph (40.16 km/h)
30 mph (48.28 km/h)29.94 mph (48.19 km/h)
35 mph (56.33 km/h)34.93 mph (56.22 km/h)
40 mph (64.37 km/h)39.92 mph (64.25 km/h)
45 mph (72.42 km/h)44.91 mph (72.28 km/h)
50 mph (80.47 km/h)49.9 mph (80.31 km/h)
55 mph (88.51 km/h)54.89 mph (88.34 km/h)
60 mph (96.56 km/h)59.88 mph (96.37 km/h)
65 mph (104.61 km/h)64.87 mph (104.41 km/h)
70 mph (112.65 km/h)69.87 mph (112.44 km/h)
75 mph (120.7 km/h)74.86 mph (120.47 km/h)
80 mph (128.75 km/h)79.85 mph (128.5 km/h)
85 mph (136.79 km/h)84.84 mph (136.53 km/h)
90 mph (144.84 km/h)89.83 mph (144.56 km/h)
95 mph (152.89 km/h)94.82 mph (152.59 km/h)
100 mph (160.93 km/h)99.81 mph (160.62 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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