Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
275/50r17 vs 285/40r17 Tire Comparison Side By Side
  275/50-17 285/40-17 Difference
Diameter inches (mm) 27.83 (706.8) 25.98 (659.8) -1.85 (-47) -6.6%
Width inches (mm) 10.83 (275) 11.22 (285) 0.39 (10) 3.6%
Circum. inches (mm) 87.42 (2220.48) 81.61 (2072.82) -5.81 (-147.65) -6.6%
Sidewall Height inches (mm) 5.41 (137.5) 4.49 (114) -0.93 (-23.5) -17.1%
Revolutions per mile (km) 724.77 (450.35) 776.4 (482.43) 51.63 (32.08) 7.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.67 mph (30.05 km/h)
25 mph (40.23 km/h)23.34 mph (37.56 km/h)
30 mph (48.28 km/h)28.01 mph (45.07 km/h)
35 mph (56.33 km/h)32.67 mph (52.58 km/h)
40 mph (64.37 km/h)37.34 mph (60.09 km/h)
45 mph (72.42 km/h)42.01 mph (67.6 km/h)
50 mph (80.47 km/h)46.68 mph (75.12 km/h)
55 mph (88.51 km/h)51.34 mph (82.63 km/h)
60 mph (96.56 km/h)56.01 mph (90.14 km/h)
65 mph (104.61 km/h)60.68 mph (97.65 km/h)
70 mph (112.65 km/h)65.35 mph (105.16 km/h)
75 mph (120.7 km/h)70.01 mph (112.67 km/h)
80 mph (128.75 km/h)74.68 mph (120.19 km/h)
85 mph (136.79 km/h)79.35 mph (127.7 km/h)
90 mph (144.84 km/h)84.02 mph (135.21 km/h)
95 mph (152.89 km/h)88.68 mph (142.72 km/h)
100 mph (160.93 km/h)93.35 mph (150.23 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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