Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
335/30r20 vs 285/35r20 Tire Comparison Side By Side
  335/30-20 285/35-20 Difference
Diameter inches (mm) 27.91 (709) 27.85 (707.5) -0.06 (-1.5) -0.2%
Width inches (mm) 13.19 (335) 11.22 (285) -1.97 (-50) -14.9%
Circum. inches (mm) 87.69 (2227.39) 87.51 (2222.68) -0.19 (-4.71) -0.2%
Sidewall Height inches (mm) 3.96 (100.5) 3.93 (99.75) -0.03 (-0.75) -0.7%
Revolutions per mile (km) 722.52 (448.96) 724.06 (449.91) 1.53 (0.95) 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 (40.15 km/h)
30 mph (48.28 km/h)29.94 mph (48.18 km/h)
35 mph (56.33 km/h)34.93 mph (56.21 km/h)
40 mph (64.37 km/h)39.92 mph (64.24 km/h)
45 mph (72.42 km/h)44.9 mph (72.27 km/h)
50 mph (80.47 km/h)49.89 mph (80.3 km/h)
55 mph (88.51 km/h)54.88 mph (88.33 km/h)
60 mph (96.56 km/h)59.87 mph (96.36 km/h)
65 mph (104.61 km/h)64.86 mph (104.39 km/h)
70 mph (112.65 km/h)69.85 mph (112.42 km/h)
75 mph (120.7 km/h)74.84 mph (120.45 km/h)
80 mph (128.75 km/h)79.83 mph (128.48 km/h)
85 mph (136.79 km/h)84.82 mph (136.51 km/h)
90 mph (144.84 km/h)89.81 mph (144.53 km/h)
95 mph (152.89 km/h)94.8 mph (152.56 km/h)
100 mph (160.93 km/h)99.79 mph (160.59 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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