Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
80/80r17 vs 45/80r17 Tire Comparison Side By Side
  80/80-17 45/80-17 Difference
Diameter inches (mm) 22.04 (559.8) 19.83 (503.8) -2.2 (-56) -10%
Width inches (mm) 3.15 (80) 1.77 (45) -1.38 (-35) -43.8%
Circum. inches (mm) 69.24 (1758.66) 62.31 (1582.73) -6.93 (-175.93) -10%
Sidewall Height inches (mm) 2.52 (64) 1.42 (36) -1.1 (-28) -43.8%
Revolutions per mile (km) 915.09 (568.61) 1016.81 (631.82) 101.72 (63.2) 11.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18 mph (28.97 km/h)
25 mph (40.23 km/h)22.5 mph (36.21 km/h)
30 mph (48.28 km/h)27 mph (43.45 km/h)
35 mph (56.33 km/h)31.5 mph (50.69 km/h)
40 mph (64.37 km/h)36 mph (57.93 km/h)
45 mph (72.42 km/h)40.5 mph (65.18 km/h)
50 mph (80.47 km/h)45 mph (72.42 km/h)
55 mph (88.51 km/h)49.5 mph (79.66 km/h)
60 mph (96.56 km/h)54 mph (86.9 km/h)
65 mph (104.61 km/h)58.5 mph (94.14 km/h)
70 mph (112.65 km/h)63 mph (101.38 km/h)
75 mph (120.7 km/h)67.5 mph (108.63 km/h)
80 mph (128.75 km/h)72 mph (115.87 km/h)
85 mph (136.79 km/h)76.5 mph (123.11 km/h)
90 mph (144.84 km/h)81 mph (130.35 km/h)
95 mph (152.89 km/h)85.5 mph (137.59 km/h)
100 mph (160.93 km/h)90 mph (144.84 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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