Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
245/60r18 vs 285/45r22 Tire Comparison Side By Side
  245/60-18 285/45-22 Difference
Diameter inches (mm) 29.57 (751.2) 32.1 (815.3) 2.52 (64.1) 8.5%
Width inches (mm) 9.65 (245) 11.22 (285) 1.57 (40) 16.3%
Circum. inches (mm) 92.91 (2359.96) 100.84 (2561.34) 7.93 (201.38) 8.5%
Sidewall Height inches (mm) 5.79 (147) 5.05 (128.25) -0.74 (-18.75) -12.8%
Revolutions per mile (km) 681.94 (423.73) 628.32 (390.42) -53.61 (-33.31) -7.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.71 mph (34.93 km/h)
25 mph (40.23 km/h)27.13 mph (43.67 km/h)
30 mph (48.28 km/h)32.56 mph (52.4 km/h)
35 mph (56.33 km/h)37.99 mph (61.13 km/h)
40 mph (64.37 km/h)43.41 mph (69.87 km/h)
45 mph (72.42 km/h)48.84 mph (78.6 km/h)
50 mph (80.47 km/h)54.27 mph (87.33 km/h)
55 mph (88.51 km/h)59.69 mph (96.07 km/h)
60 mph (96.56 km/h)65.12 mph (104.8 km/h)
65 mph (104.61 km/h)70.55 mph (113.53 km/h)
70 mph (112.65 km/h)75.97 mph (122.27 km/h)
75 mph (120.7 km/h)81.4 mph (131 km/h)
80 mph (128.75 km/h)86.83 mph (139.73 km/h)
85 mph (136.79 km/h)92.25 mph (148.47 km/h)
90 mph (144.84 km/h)97.68 mph (157.2 km/h)
95 mph (152.89 km/h)103.11 mph (165.93 km/h)
100 mph (160.93 km/h)108.53 mph (174.67 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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