Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
285/25r20 vs 285/35r20 Tire Comparison Side By Side
  285/25-20 285/35-20 Difference
Diameter inches (mm) 25.61 (650.5) 27.85 (707.5) 2.24 (57) 8.8%
Width inches (mm) 11.22 (285) 11.22 (285) 0 (0) 0%
Circum. inches (mm) 80.46 (2043.61) 87.51 (2222.68) 7.05 (179.07) 8.8%
Sidewall Height inches (mm) 2.81 (71.25) 3.93 (99.75) 1.12 (28.5) 40%
Revolutions per mile (km) 787.5 (489.33) 724.06 (449.91) -63.45 (-39.42) -8.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.75 mph (35.01 km/h)
25 mph (40.23 km/h)27.19 mph (43.76 km/h)
30 mph (48.28 km/h)32.63 mph (52.51 km/h)
35 mph (56.33 km/h)38.07 mph (61.26 km/h)
40 mph (64.37 km/h)43.5 mph (70.01 km/h)
45 mph (72.42 km/h)48.94 mph (78.77 km/h)
50 mph (80.47 km/h)54.38 mph (87.52 km/h)
55 mph (88.51 km/h)59.82 mph (96.27 km/h)
60 mph (96.56 km/h)65.26 mph (105.02 km/h)
65 mph (104.61 km/h)70.7 mph (113.77 km/h)
70 mph (112.65 km/h)76.13 mph (122.53 km/h)
75 mph (120.7 km/h)81.57 mph (131.28 km/h)
80 mph (128.75 km/h)87.01 mph (140.03 km/h)
85 mph (136.79 km/h)92.45 mph (148.78 km/h)
90 mph (144.84 km/h)97.89 mph (157.53 km/h)
95 mph (152.89 km/h)103.32 mph (166.28 km/h)
100 mph (160.93 km/h)108.76 mph (175.04 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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