Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
315/30r19 vs 305/35r18 Tire Comparison Side By Side
  315/30-19 305/35-18 Difference
Diameter inches (mm) 26.44 (671.6) 26.41 (670.7) -0.04 (-0.9) -0.1%
Width inches (mm) 12.4 (315) 12.01 (305) -0.39 (-10) -3.2%
Circum. inches (mm) 83.07 (2109.89) 82.96 (2107.07) -0.11 (-2.83) -0.1%
Sidewall Height inches (mm) 3.72 (94.5) 4.2 (106.75) 0.48 (12.25) 13%
Revolutions per mile (km) 762.76 (473.96) 763.78 (474.59) 1.02 (0.64) 0.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.97 mph (32.14 km/h)
25 mph (40.23 km/h)24.97 mph (40.18 km/h)
30 mph (48.28 km/h)29.96 mph (48.22 km/h)
35 mph (56.33 km/h)34.95 mph (56.25 km/h)
40 mph (64.37 km/h)39.95 mph (64.29 km/h)
45 mph (72.42 km/h)44.94 mph (72.32 km/h)
50 mph (80.47 km/h)49.93 mph (80.36 km/h)
55 mph (88.51 km/h)54.93 mph (88.4 km/h)
60 mph (96.56 km/h)59.92 mph (96.43 km/h)
65 mph (104.61 km/h)64.91 mph (104.47 km/h)
70 mph (112.65 km/h)69.91 mph (112.5 km/h)
75 mph (120.7 km/h)74.9 mph (120.54 km/h)
80 mph (128.75 km/h)79.89 mph (128.58 km/h)
85 mph (136.79 km/h)84.89 mph (136.61 km/h)
90 mph (144.84 km/h)89.88 mph (144.65 km/h)
95 mph (152.89 km/h)94.87 mph (152.68 km/h)
100 mph (160.93 km/h)99.87 mph (160.72 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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