Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
285/40r17 vs 275/50r17 Tire Comparison Side By Side
  285/40-17 275/50-17 Difference
Diameter inches (mm) 25.98 (659.8) 27.83 (706.8) 1.85 (47) 7.1%
Width inches (mm) 11.22 (285) 10.83 (275) -0.39 (-10) -3.5%
Circum. inches (mm) 81.61 (2072.82) 87.42 (2220.48) 5.81 (147.65) 7.1%
Sidewall Height inches (mm) 4.49 (114) 5.41 (137.5) 0.93 (23.5) 20.6%
Revolutions per mile (km) 776.4 (482.43) 724.77 (450.35) -51.63 (-32.08) -6.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.42 mph (34.48 km/h)
25 mph (40.23 km/h)26.78 mph (43.1 km/h)
30 mph (48.28 km/h)32.14 mph (51.72 km/h)
35 mph (56.33 km/h)37.49 mph (60.34 km/h)
40 mph (64.37 km/h)42.85 mph (68.96 km/h)
45 mph (72.42 km/h)48.21 mph (77.58 km/h)
50 mph (80.47 km/h)53.56 mph (86.2 km/h)
55 mph (88.51 km/h)58.92 mph (94.82 km/h)
60 mph (96.56 km/h)64.27 mph (103.44 km/h)
65 mph (104.61 km/h)69.63 mph (112.06 km/h)
70 mph (112.65 km/h)74.99 mph (120.68 km/h)
75 mph (120.7 km/h)80.34 mph (129.3 km/h)
80 mph (128.75 km/h)85.7 mph (137.92 km/h)
85 mph (136.79 km/h)91.05 mph (146.54 km/h)
90 mph (144.84 km/h)96.41 mph (155.16 km/h)
95 mph (152.89 km/h)101.77 mph (163.78 km/h)
100 mph (160.93 km/h)107.12 mph (172.4 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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