Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
285/60r17 vs 315/70r17 Tire Comparison Side By Side
  285/60-17 315/70-17 Difference
Diameter inches (mm) 30.46 (773.8) 34.36 (872.8) 3.9 (99) 12.8%
Width inches (mm) 11.22 (285) 12.4 (315) 1.18 (30) 10.5%
Circum. inches (mm) 95.71 (2430.96) 107.95 (2741.98) 12.24 (311.02) 12.8%
Sidewall Height inches (mm) 6.73 (171) 8.68 (220.5) 1.95 (49.5) 28.9%
Revolutions per mile (km) 662.02 (411.36) 586.93 (364.7) -75.09 (-46.66) -11.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)22.56 mph (36.3 km/h)
25 mph (40.23 km/h)28.2 mph (45.38 km/h)
30 mph (48.28 km/h)33.84 mph (54.46 km/h)
35 mph (56.33 km/h)39.48 mph (63.53 km/h)
40 mph (64.37 km/h)45.12 mph (72.61 km/h)
45 mph (72.42 km/h)50.76 mph (81.69 km/h)
50 mph (80.47 km/h)56.4 mph (90.76 km/h)
55 mph (88.51 km/h)62.04 mph (99.84 km/h)
60 mph (96.56 km/h)67.68 mph (108.91 km/h)
65 mph (104.61 km/h)73.32 mph (117.99 km/h)
70 mph (112.65 km/h)78.96 mph (127.07 km/h)
75 mph (120.7 km/h)84.6 mph (136.14 km/h)
80 mph (128.75 km/h)90.24 mph (145.22 km/h)
85 mph (136.79 km/h)95.87 mph (154.3 km/h)
90 mph (144.84 km/h)101.51 mph (163.37 km/h)
95 mph (152.89 km/h)107.15 mph (172.45 km/h)
100 mph (160.93 km/h)112.79 mph (181.52 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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