Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
100/90r18 vs 110/100r18 Tire Comparison Side By Side
  100/90-18 110/100-18 Difference
Diameter inches (mm) 25.09 (637.2) 26.66 (677.2) 1.57 (40) 6.3%
Width inches (mm) 3.94 (100) 4.33 (110) 0.39 (10) 10%
Circum. inches (mm) 78.81 (2001.82) 83.76 (2127.49) 4.95 (125.66) 6.3%
Sidewall Height inches (mm) 3.54 (90) 4.33 (110) 0.79 (20) 22.2%
Revolutions per mile (km) 803.94 (499.54) 756.45 (470.04) -47.49 (-29.51) -5.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.26 mph (34.21 km/h)
25 mph (40.23 km/h)26.57 mph (42.76 km/h)
30 mph (48.28 km/h)31.88 mph (51.31 km/h)
35 mph (56.33 km/h)37.2 mph (59.86 km/h)
40 mph (64.37 km/h)42.51 mph (68.41 km/h)
45 mph (72.42 km/h)47.82 mph (76.97 km/h)
50 mph (80.47 km/h)53.14 mph (85.52 km/h)
55 mph (88.51 km/h)58.45 mph (94.07 km/h)
60 mph (96.56 km/h)63.77 mph (102.62 km/h)
65 mph (104.61 km/h)69.08 mph (111.17 km/h)
70 mph (112.65 km/h)74.39 mph (119.73 km/h)
75 mph (120.7 km/h)79.71 mph (128.28 km/h)
80 mph (128.75 km/h)85.02 mph (136.83 km/h)
85 mph (136.79 km/h)90.34 mph (145.38 km/h)
90 mph (144.84 km/h)95.65 mph (153.93 km/h)
95 mph (152.89 km/h)100.96 mph (162.49 km/h)
100 mph (160.93 km/h)106.28 mph (171.04 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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