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 285/70r15 Tire Comparison Side By Side
  33/11.5-15 285/70-15 Difference
Diameter inches (mm) 32.93 (836.52) 30.71 (780) -2.23 (-56.52) -6.8%
Width inches (mm) 11.5 (292) 11.22 (285) -0.28 (-7) -2.4%
Circum. inches (mm) 103.46 (2628.01) 96.47 (2450.44) -6.99 (-177.56) -6.8%
Sidewall Height inches (mm) 8.97 (227.76) 7.85 (199.5) -1.11 (-28.26) -12.4%
Revolutions per mile (km) 612.38 (380.52) 656.76 (408.09) 44.37 (27.57) 7.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.65 mph (30.01 km/h)
25 mph (40.23 km/h)23.31 mph (37.52 km/h)
30 mph (48.28 km/h)27.97 mph (45.02 km/h)
35 mph (56.33 km/h)32.64 mph (52.52 km/h)
40 mph (64.37 km/h)37.3 mph (60.02 km/h)
45 mph (72.42 km/h)41.96 mph (67.53 km/h)
50 mph (80.47 km/h)46.62 mph (75.03 km/h)
55 mph (88.51 km/h)51.28 mph (82.53 km/h)
60 mph (96.56 km/h)55.95 mph (90.04 km/h)
65 mph (104.61 km/h)60.61 mph (97.54 km/h)
70 mph (112.65 km/h)65.27 mph (105.04 km/h)
75 mph (120.7 km/h)69.93 mph (112.55 km/h)
80 mph (128.75 km/h)74.59 mph (120.05 km/h)
85 mph (136.79 km/h)79.26 mph (127.55 km/h)
90 mph (144.84 km/h)83.92 mph (135.05 km/h)
95 mph (152.89 km/h)88.58 mph (142.56 km/h)
100 mph (160.93 km/h)93.24 mph (150.06 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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