Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
33/11.5r15 vs 285/80r15 Tire Comparison Side By Side
  33/11.5-15 285/80-15 Difference
Diameter inches (mm) 32.93 (836.52) 32.95 (837) 0.02 (0.48) 0.1%
Width inches (mm) 11.5 (292) 11.22 (285) -0.28 (-7) -2.4%
Circum. inches (mm) 103.46 (2628.01) 103.52 (2629.51) 0.06 (1.51) 0.1%
Sidewall Height inches (mm) 8.97 (227.76) 8.98 (228) 0.01 (0.24) 0.1%
Revolutions per mile (km) 612.38 (380.52) 612.03 (380.3) -0.35 (-0.22) -0.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.01 mph (32.21 km/h)
25 mph (40.23 km/h)25.01 mph (40.26 km/h)
30 mph (48.28 km/h)30.02 mph (48.31 km/h)
35 mph (56.33 km/h)35.02 mph (56.36 km/h)
40 mph (64.37 km/h)40.02 mph (64.41 km/h)
45 mph (72.42 km/h)45.03 mph (72.46 km/h)
50 mph (80.47 km/h)50.03 mph (80.51 km/h)
55 mph (88.51 km/h)55.03 mph (88.56 km/h)
60 mph (96.56 km/h)60.03 mph (96.62 km/h)
65 mph (104.61 km/h)65.04 mph (104.67 km/h)
70 mph (112.65 km/h)70.04 mph (112.72 km/h)
75 mph (120.7 km/h)75.04 mph (120.77 km/h)
80 mph (128.75 km/h)80.05 mph (128.82 km/h)
85 mph (136.79 km/h)85.05 mph (136.87 km/h)
90 mph (144.84 km/h)90.05 mph (144.92 km/h)
95 mph (152.89 km/h)95.05 mph (152.98 km/h)
100 mph (160.93 km/h)100.06 mph (161.03 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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