Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
100/70r17 vs 90/90r17 Tire Comparison Side By Side
  100/70-17 90/90-17 Difference
Diameter inches (mm) 22.51 (571.8) 23.38 (593.8) 0.87 (22) 3.8%
Width inches (mm) 3.94 (100) 3.54 (90) -0.39 (-10) -10%
Circum. inches (mm) 70.72 (1796.36) 73.44 (1865.48) 2.72 (69.12) 3.8%
Sidewall Height inches (mm) 2.76 (70) 3.19 (81) 0.43 (11) 15.7%
Revolutions per mile (km) 895.89 (556.68) 862.7 (536.05) -33.19 (-20.62) -3.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.77 mph (33.43 km/h)
25 mph (40.23 km/h)25.96 mph (41.78 km/h)
30 mph (48.28 km/h)31.15 mph (50.14 km/h)
35 mph (56.33 km/h)36.35 mph (58.49 km/h)
40 mph (64.37 km/h)41.54 mph (66.85 km/h)
45 mph (72.42 km/h)46.73 mph (75.21 km/h)
50 mph (80.47 km/h)51.92 mph (83.56 km/h)
55 mph (88.51 km/h)57.12 mph (91.92 km/h)
60 mph (96.56 km/h)62.31 mph (100.28 km/h)
65 mph (104.61 km/h)67.5 mph (108.63 km/h)
70 mph (112.65 km/h)72.69 mph (116.99 km/h)
75 mph (120.7 km/h)77.89 mph (125.35 km/h)
80 mph (128.75 km/h)83.08 mph (133.7 km/h)
85 mph (136.79 km/h)88.27 mph (142.06 km/h)
90 mph (144.84 km/h)93.46 mph (150.41 km/h)
95 mph (152.89 km/h)98.66 mph (158.77 km/h)
100 mph (160.93 km/h)103.85 mph (167.13 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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