Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
315/25r19 vs 315/75r18 Tire Comparison Side By Side
  315/25-19 315/75-18 Difference
Diameter inches (mm) 25.2 (640.1) 36.6 (929.7) 11.4 (289.6) 45.2%
Width inches (mm) 12.4 (315) 12.4 (315) 0 (0) 0%
Circum. inches (mm) 79.17 (2010.93) 114.99 (2920.74) 35.82 (909.81) 45.2%
Sidewall Height inches (mm) 3.1 (78.75) 9.3 (236.25) 6.2 (157.5) 200%
Revolutions per mile (km) 800.3 (497.28) 551.01 (342.38) -249.29 (-154.9) -31.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)29.05 mph (46.75 km/h)
25 mph (40.23 km/h)36.31 mph (58.44 km/h)
30 mph (48.28 km/h)43.57 mph (70.12 km/h)
35 mph (56.33 km/h)50.84 mph (81.81 km/h)
40 mph (64.37 km/h)58.1 mph (93.5 km/h)
45 mph (72.42 km/h)65.36 mph (105.19 km/h)
50 mph (80.47 km/h)72.62 mph (116.87 km/h)
55 mph (88.51 km/h)79.88 mph (128.56 km/h)
60 mph (96.56 km/h)87.15 mph (140.25 km/h)
65 mph (104.61 km/h)94.41 mph (151.94 km/h)
70 mph (112.65 km/h)101.67 mph (163.62 km/h)
75 mph (120.7 km/h)108.93 mph (175.31 km/h)
80 mph (128.75 km/h)116.19 mph (187 km/h)
85 mph (136.79 km/h)123.46 mph (198.68 km/h)
90 mph (144.84 km/h)130.72 mph (210.37 km/h)
95 mph (152.89 km/h)137.98 mph (222.06 km/h)
100 mph (160.93 km/h)145.24 mph (233.75 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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