Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
315/45r16 vs 285/75r16 Tire Comparison Side By Side
  315/45-16 285/75-16 Difference
Diameter inches (mm) 27.16 (689.9) 32.83 (833.9) 5.67 (144) 20.9%
Width inches (mm) 12.4 (315) 11.22 (285) -1.18 (-30) -9.5%
Circum. inches (mm) 85.33 (2167.38) 103.14 (2619.77) 17.81 (452.39) 20.9%
Sidewall Height inches (mm) 5.58 (141.75) 8.42 (213.75) 2.83 (72) 50.8%
Revolutions per mile (km) 742.53 (461.38) 614.31 (381.71) -128.22 (-79.67) -17.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)24.17 mph (38.91 km/h)
25 mph (40.23 km/h)30.22 mph (48.63 km/h)
30 mph (48.28 km/h)36.26 mph (58.36 km/h)
35 mph (56.33 km/h)42.31 mph (68.08 km/h)
40 mph (64.37 km/h)48.35 mph (77.81 km/h)
45 mph (72.42 km/h)54.39 mph (87.54 km/h)
50 mph (80.47 km/h)60.44 mph (97.26 km/h)
55 mph (88.51 km/h)66.48 mph (106.99 km/h)
60 mph (96.56 km/h)72.52 mph (116.72 km/h)
65 mph (104.61 km/h)78.57 mph (126.44 km/h)
70 mph (112.65 km/h)84.61 mph (136.17 km/h)
75 mph (120.7 km/h)90.65 mph (145.89 km/h)
80 mph (128.75 km/h)96.7 mph (155.62 km/h)
85 mph (136.79 km/h)102.74 mph (165.35 km/h)
90 mph (144.84 km/h)108.79 mph (175.07 km/h)
95 mph (152.89 km/h)114.83 mph (184.8 km/h)
100 mph (160.93 km/h)120.87 mph (194.53 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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