Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
315/70r17 vs 318/72r17 Tire Comparison Side By Side
  315/70-17 318/72-17 Difference
Diameter inches (mm) 34.36 (872.8) 35.03 (889.72) 0.67 (16.92) 1.9%
Width inches (mm) 12.4 (315) 12.52 (318) 0.12 (3) 1%
Circum. inches (mm) 107.95 (2741.98) 110.04 (2795.14) 2.09 (53.16) 1.9%
Sidewall Height inches (mm) 8.68 (220.5) 9.01 (228.96) 0.33 (8.46) 3.8%
Revolutions per mile (km) 586.93 (364.7) 575.77 (357.76) -11.16 (-6.94) -1.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.39 mph (32.81 km/h)
25 mph (40.23 km/h)25.48 mph (41.01 km/h)
30 mph (48.28 km/h)30.58 mph (49.22 km/h)
35 mph (56.33 km/h)35.68 mph (57.42 km/h)
40 mph (64.37 km/h)40.78 mph (65.62 km/h)
45 mph (72.42 km/h)45.87 mph (73.82 km/h)
50 mph (80.47 km/h)50.97 mph (82.03 km/h)
55 mph (88.51 km/h)56.07 mph (90.23 km/h)
60 mph (96.56 km/h)61.16 mph (98.43 km/h)
65 mph (104.61 km/h)66.26 mph (106.64 km/h)
70 mph (112.65 km/h)71.36 mph (114.84 km/h)
75 mph (120.7 km/h)76.45 mph (123.04 km/h)
80 mph (128.75 km/h)81.55 mph (131.24 km/h)
85 mph (136.79 km/h)86.65 mph (139.45 km/h)
90 mph (144.84 km/h)91.74 mph (147.65 km/h)
95 mph (152.89 km/h)96.84 mph (155.85 km/h)
100 mph (160.93 km/h)101.94 mph (164.05 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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