Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
80/70r17 vs 45/90r17 Tire Comparison Side By Side
  80/70-17 45/90-17 Difference
Diameter inches (mm) 21.41 (543.8) 20.19 (512.8) -1.22 (-31) -5.7%
Width inches (mm) 3.15 (80) 1.77 (45) -1.38 (-35) -43.8%
Circum. inches (mm) 67.26 (1708.4) 63.43 (1611.01) -3.83 (-97.39) -5.7%
Sidewall Height inches (mm) 2.2 (56) 1.59 (40.5) -0.61 (-15.5) -27.7%
Revolutions per mile (km) 942.02 (585.34) 998.97 (620.73) 56.95 (35.39) 6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.86 mph (30.35 km/h)
25 mph (40.23 km/h)23.57 mph (37.94 km/h)
30 mph (48.28 km/h)28.29 mph (45.53 km/h)
35 mph (56.33 km/h)33 mph (53.12 km/h)
40 mph (64.37 km/h)37.72 mph (60.7 km/h)
45 mph (72.42 km/h)42.43 mph (68.29 km/h)
50 mph (80.47 km/h)47.15 mph (75.88 km/h)
55 mph (88.51 km/h)51.86 mph (83.47 km/h)
60 mph (96.56 km/h)56.58 mph (91.06 km/h)
65 mph (104.61 km/h)61.29 mph (98.64 km/h)
70 mph (112.65 km/h)66.01 mph (106.23 km/h)
75 mph (120.7 km/h)70.72 mph (113.82 km/h)
80 mph (128.75 km/h)75.44 mph (121.41 km/h)
85 mph (136.79 km/h)80.15 mph (129 km/h)
90 mph (144.84 km/h)84.87 mph (136.58 km/h)
95 mph (152.89 km/h)89.58 mph (144.17 km/h)
100 mph (160.93 km/h)94.3 mph (151.76 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
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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