Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
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285/55r20 vs 295/65r20 Tire Comparison Side By Side
  285/55-20 295/65-20 Difference
Diameter inches (mm) 32.34 (821.5) 35.1 (891.5) 2.76 (70) 8.5%
Width inches (mm) 11.22 (285) 11.61 (295) 0.39 (10) 3.5%
Circum. inches (mm) 101.61 (2580.82) 110.26 (2800.73) 8.66 (219.91) 8.5%
Sidewall Height inches (mm) 6.17 (156.75) 7.55 (191.75) 1.38 (35) 22.3%
Revolutions per mile (km) 623.58 (387.47) 574.62 (357.05) -48.96 (-30.42) -7.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.7 mph (34.93 km/h)
25 mph (40.23 km/h)27.13 mph (43.66 km/h)
30 mph (48.28 km/h)32.56 mph (52.39 km/h)
35 mph (56.33 km/h)37.98 mph (61.13 km/h)
40 mph (64.37 km/h)43.41 mph (69.86 km/h)
45 mph (72.42 km/h)48.83 mph (78.59 km/h)
50 mph (80.47 km/h)54.26 mph (87.32 km/h)
55 mph (88.51 km/h)59.69 mph (96.06 km/h)
60 mph (96.56 km/h)65.11 mph (104.79 km/h)
65 mph (104.61 km/h)70.54 mph (113.52 km/h)
70 mph (112.65 km/h)75.96 mph (122.25 km/h)
75 mph (120.7 km/h)81.39 mph (130.99 km/h)
80 mph (128.75 km/h)86.82 mph (139.72 km/h)
85 mph (136.79 km/h)92.24 mph (148.45 km/h)
90 mph (144.84 km/h)97.67 mph (157.18 km/h)
95 mph (152.89 km/h)103.09 mph (165.92 km/h)
100 mph (160.93 km/h)108.52 mph (174.65 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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