Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
285/50r20 vs 285/60r20 Tire Comparison Side By Side
  285/50-20 285/60-20 Difference
Diameter inches (mm) 31.22 (793) 33.46 (850) 2.24 (57) 7.2%
Width inches (mm) 11.22 (285) 11.22 (285) 0 (0) 0%
Circum. inches (mm) 98.08 (2491.28) 105.13 (2670.35) 7.05 (179.07) 7.2%
Sidewall Height inches (mm) 5.61 (142.5) 6.73 (171) 1.12 (28.5) 20%
Revolutions per mile (km) 645.99 (401.4) 602.67 (374.48) -43.32 (-26.92) -6.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.44 mph (34.5 km/h)
25 mph (40.23 km/h)26.8 mph (43.13 km/h)
30 mph (48.28 km/h)32.16 mph (51.75 km/h)
35 mph (56.33 km/h)37.52 mph (60.38 km/h)
40 mph (64.37 km/h)42.88 mph (69 km/h)
45 mph (72.42 km/h)48.23 mph (77.63 km/h)
50 mph (80.47 km/h)53.59 mph (86.25 km/h)
55 mph (88.51 km/h)58.95 mph (94.88 km/h)
60 mph (96.56 km/h)64.31 mph (103.5 km/h)
65 mph (104.61 km/h)69.67 mph (112.13 km/h)
70 mph (112.65 km/h)75.03 mph (120.75 km/h)
75 mph (120.7 km/h)80.39 mph (129.38 km/h)
80 mph (128.75 km/h)85.75 mph (138 km/h)
85 mph (136.79 km/h)91.11 mph (146.63 km/h)
90 mph (144.84 km/h)96.47 mph (155.25 km/h)
95 mph (152.89 km/h)101.83 mph (163.88 km/h)
100 mph (160.93 km/h)107.19 mph (172.5 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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