Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
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90/90r19 vs 110/90r18 Tire Comparison Side By Side
  90/90-19 110/90-18 Difference
Diameter inches (mm) 25.38 (644.6) 25.8 (655.2) 0.42 (10.6) 1.6%
Width inches (mm) 3.54 (90) 4.33 (110) 0.79 (20) 22.2%
Circum. inches (mm) 79.73 (2025.07) 81.04 (2058.37) 1.31 (33.3) 1.6%
Sidewall Height inches (mm) 3.19 (81) 3.9 (99) 0.71 (18) 22.2%
Revolutions per mile (km) 794.71 (493.81) 781.85 (485.82) -12.86 (-7.99) -1.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.33 mph (32.72 km/h)
25 mph (40.23 km/h)25.41 mph (40.9 km/h)
30 mph (48.28 km/h)30.49 mph (49.07 km/h)
35 mph (56.33 km/h)35.58 mph (57.25 km/h)
40 mph (64.37 km/h)40.66 mph (65.43 km/h)
45 mph (72.42 km/h)45.74 mph (73.61 km/h)
50 mph (80.47 km/h)50.82 mph (81.79 km/h)
55 mph (88.51 km/h)55.9 mph (89.97 km/h)
60 mph (96.56 km/h)60.99 mph (98.15 km/h)
65 mph (104.61 km/h)66.07 mph (106.33 km/h)
70 mph (112.65 km/h)71.15 mph (114.51 km/h)
75 mph (120.7 km/h)76.23 mph (122.69 km/h)
80 mph (128.75 km/h)81.32 mph (130.86 km/h)
85 mph (136.79 km/h)86.4 mph (139.04 km/h)
90 mph (144.84 km/h)91.48 mph (147.22 km/h)
95 mph (152.89 km/h)96.56 mph (155.4 km/h)
100 mph (160.93 km/h)101.64 mph (163.58 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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