Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
110/100r18 vs 120/80r18 Tire Comparison Side By Side
  110/100-18 120/80-18 Difference
Diameter inches (mm) 26.66 (677.2) 25.56 (649.2) -1.1 (-28) -4.1%
Width inches (mm) 4.33 (110) 4.72 (120) 0.39 (10) 9.1%
Circum. inches (mm) 83.76 (2127.49) 80.3 (2039.52) -3.46 (-87.96) -4.1%
Sidewall Height inches (mm) 4.33 (110) 3.78 (96) -0.55 (-14) -12.7%
Revolutions per mile (km) 756.45 (470.04) 789.08 (490.31) 32.63 (20.27) 4.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.17 mph (30.86 km/h)
25 mph (40.23 km/h)23.97 mph (38.57 km/h)
30 mph (48.28 km/h)28.76 mph (46.28 km/h)
35 mph (56.33 km/h)33.55 mph (54 km/h)
40 mph (64.37 km/h)38.35 mph (61.71 km/h)
45 mph (72.42 km/h)43.14 mph (69.43 km/h)
50 mph (80.47 km/h)47.93 mph (77.14 km/h)
55 mph (88.51 km/h)52.73 mph (84.85 km/h)
60 mph (96.56 km/h)57.52 mph (92.57 km/h)
65 mph (104.61 km/h)62.31 mph (100.28 km/h)
70 mph (112.65 km/h)67.11 mph (108 km/h)
75 mph (120.7 km/h)71.9 mph (115.71 km/h)
80 mph (128.75 km/h)76.69 mph (123.42 km/h)
85 mph (136.79 km/h)81.49 mph (131.14 km/h)
90 mph (144.84 km/h)86.28 mph (138.85 km/h)
95 mph (152.89 km/h)91.07 mph (146.57 km/h)
100 mph (160.93 km/h)95.87 mph (154.28 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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