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 285/75r16 Tire Comparison Side By Side
  315/70-17 285/75-16 Difference
Diameter inches (mm) 34.36 (872.8) 32.83 (833.9) -1.53 (-38.9) -4.5%
Width inches (mm) 12.4 (315) 11.22 (285) -1.18 (-30) -9.5%
Circum. inches (mm) 107.95 (2741.98) 103.14 (2619.77) -4.81 (-122.21) -4.5%
Sidewall Height inches (mm) 8.68 (220.5) 8.42 (213.75) -0.27 (-6.75) -3.1%
Revolutions per mile (km) 586.93 (364.7) 614.31 (381.71) 27.38 (17.01) 4.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.11 mph (30.75 km/h)
25 mph (40.23 km/h)23.89 mph (38.44 km/h)
30 mph (48.28 km/h)28.66 mph (46.13 km/h)
35 mph (56.33 km/h)33.44 mph (53.82 km/h)
40 mph (64.37 km/h)38.22 mph (61.5 km/h)
45 mph (72.42 km/h)42.99 mph (69.19 km/h)
50 mph (80.47 km/h)47.77 mph (76.88 km/h)
55 mph (88.51 km/h)52.55 mph (84.57 km/h)
60 mph (96.56 km/h)57.33 mph (92.26 km/h)
65 mph (104.61 km/h)62.1 mph (99.95 km/h)
70 mph (112.65 km/h)66.88 mph (107.63 km/h)
75 mph (120.7 km/h)71.66 mph (115.32 km/h)
80 mph (128.75 km/h)76.43 mph (123.01 km/h)
85 mph (136.79 km/h)81.21 mph (130.7 km/h)
90 mph (144.84 km/h)85.99 mph (138.39 km/h)
95 mph (152.89 km/h)90.77 mph (146.07 km/h)
100 mph (160.93 km/h)95.54 mph (153.76 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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