Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
225/50r18 vs 225/35r19 Tire Comparison Side By Side
  225/50-18 225/35-19 Difference
Diameter inches (mm) 26.86 (682.2) 25.2 (640.1) -1.66 (-42.1) -6.2%
Width inches (mm) 8.86 (225) 8.86 (225) 0 (0) 0%
Circum. inches (mm) 84.38 (2143.19) 79.17 (2010.93) -5.21 (-132.26) -6.2%
Sidewall Height inches (mm) 4.43 (112.5) 3.1 (78.75) -1.33 (-33.75) -30%
Revolutions per mile (km) 750.91 (466.59) 800.3 (497.28) 49.39 (30.69) 6.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.77 mph (30.2 km/h)
25 mph (40.23 km/h)23.46 mph (37.75 km/h)
30 mph (48.28 km/h)28.15 mph (45.3 km/h)
35 mph (56.33 km/h)32.84 mph (52.85 km/h)
40 mph (64.37 km/h)37.53 mph (60.4 km/h)
45 mph (72.42 km/h)42.22 mph (67.95 km/h)
50 mph (80.47 km/h)46.91 mph (75.5 km/h)
55 mph (88.51 km/h)51.61 mph (83.05 km/h)
60 mph (96.56 km/h)56.3 mph (90.6 km/h)
65 mph (104.61 km/h)60.99 mph (98.15 km/h)
70 mph (112.65 km/h)65.68 mph (105.7 km/h)
75 mph (120.7 km/h)70.37 mph (113.25 km/h)
80 mph (128.75 km/h)75.06 mph (120.8 km/h)
85 mph (136.79 km/h)79.75 mph (128.35 km/h)
90 mph (144.84 km/h)84.45 mph (135.9 km/h)
95 mph (152.89 km/h)89.14 mph (143.45 km/h)
100 mph (160.93 km/h)93.83 mph (151 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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