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 120/100r18 Tire Comparison Side By Side
  110/100-18 120/100-18 Difference
Diameter inches (mm) 26.66 (677.2) 27.45 (697.2) 0.79 (20) 3%
Width inches (mm) 4.33 (110) 4.72 (120) 0.39 (10) 9.1%
Circum. inches (mm) 83.76 (2127.49) 86.23 (2190.32) 2.47 (62.83) 3%
Sidewall Height inches (mm) 4.33 (110) 4.72 (120) 0.39 (10) 9.1%
Revolutions per mile (km) 756.45 (470.04) 734.75 (456.55) -21.7 (-13.48) -2.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.59 mph (33.14 km/h)
25 mph (40.23 km/h)25.74 mph (41.42 km/h)
30 mph (48.28 km/h)30.89 mph (49.71 km/h)
35 mph (56.33 km/h)36.03 mph (57.99 km/h)
40 mph (64.37 km/h)41.18 mph (66.28 km/h)
45 mph (72.42 km/h)46.33 mph (74.56 km/h)
50 mph (80.47 km/h)51.48 mph (82.84 km/h)
55 mph (88.51 km/h)56.62 mph (91.13 km/h)
60 mph (96.56 km/h)61.77 mph (99.41 km/h)
65 mph (104.61 km/h)66.92 mph (107.7 km/h)
70 mph (112.65 km/h)72.07 mph (115.98 km/h)
75 mph (120.7 km/h)77.22 mph (124.27 km/h)
80 mph (128.75 km/h)82.36 mph (132.55 km/h)
85 mph (136.79 km/h)87.51 mph (140.83 km/h)
90 mph (144.84 km/h)92.66 mph (149.12 km/h)
95 mph (152.89 km/h)97.81 mph (157.4 km/h)
100 mph (160.93 km/h)102.95 mph (165.69 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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