Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
155/80r19 vs 285/50r20 Tire Comparison Side By Side
  155/80-19 285/50-20 Difference
Diameter inches (mm) 28.76 (730.6) 31.22 (793) 2.46 (62.4) 8.5%
Width inches (mm) 6.1 (155) 11.22 (285) 5.12 (130) 83.9%
Circum. inches (mm) 90.36 (2295.25) 98.08 (2491.28) 7.72 (196.04) 8.5%
Sidewall Height inches (mm) 4.88 (124) 5.61 (142.5) 0.73 (18.5) 14.9%
Revolutions per mile (km) 701.16 (435.68) 645.99 (401.4) -55.17 (-34.28) -7.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.71 mph (34.94 km/h)
25 mph (40.23 km/h)27.14 mph (43.67 km/h)
30 mph (48.28 km/h)32.56 mph (52.4 km/h)
35 mph (56.33 km/h)37.99 mph (61.14 km/h)
40 mph (64.37 km/h)43.42 mph (69.87 km/h)
45 mph (72.42 km/h)48.84 mph (78.61 km/h)
50 mph (80.47 km/h)54.27 mph (87.34 km/h)
55 mph (88.51 km/h)59.7 mph (96.07 km/h)
60 mph (96.56 km/h)65.12 mph (104.81 km/h)
65 mph (104.61 km/h)70.55 mph (113.54 km/h)
70 mph (112.65 km/h)75.98 mph (122.28 km/h)
75 mph (120.7 km/h)81.41 mph (131.01 km/h)
80 mph (128.75 km/h)86.83 mph (139.74 km/h)
85 mph (136.79 km/h)92.26 mph (148.48 km/h)
90 mph (144.84 km/h)97.69 mph (157.21 km/h)
95 mph (152.89 km/h)103.11 mph (165.95 km/h)
100 mph (160.93 km/h)108.54 mph (174.68 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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