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 320/30r19 Tire Comparison Side By Side
  315/30-19 320/30-19 Difference
Diameter inches (mm) 26.44 (671.6) 26.56 (674.6) 0.12 (3) 0.4%
Width inches (mm) 12.4 (315) 12.6 (320) 0.2 (5) 1.6%
Circum. inches (mm) 83.07 (2109.89) 83.44 (2119.32) 0.37 (9.42) 0.4%
Sidewall Height inches (mm) 3.72 (94.5) 3.78 (96) 0.06 (1.5) 1.6%
Revolutions per mile (km) 762.76 (473.96) 759.37 (471.85) -3.39 (-2.11) -0.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.09 mph (32.33 km/h)
25 mph (40.23 km/h)25.11 mph (40.41 km/h)
30 mph (48.28 km/h)30.13 mph (48.5 km/h)
35 mph (56.33 km/h)35.16 mph (56.58 km/h)
40 mph (64.37 km/h)40.18 mph (64.66 km/h)
45 mph (72.42 km/h)45.2 mph (72.74 km/h)
50 mph (80.47 km/h)50.22 mph (80.83 km/h)
55 mph (88.51 km/h)55.25 mph (88.91 km/h)
60 mph (96.56 km/h)60.27 mph (96.99 km/h)
65 mph (104.61 km/h)65.29 mph (105.07 km/h)
70 mph (112.65 km/h)70.31 mph (113.16 km/h)
75 mph (120.7 km/h)75.34 mph (121.24 km/h)
80 mph (128.75 km/h)80.36 mph (129.32 km/h)
85 mph (136.79 km/h)85.38 mph (137.41 km/h)
90 mph (144.84 km/h)90.4 mph (145.49 km/h)
95 mph (152.89 km/h)95.42 mph (153.57 km/h)
100 mph (160.93 km/h)100.45 mph (161.65 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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