Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
315/70r18 vs 295/70r18 Tire Comparison Side By Side
  315/70-18 295/70-18 Difference
Diameter inches (mm) 35.36 (898.2) 34.26 (870.2) -1.1 (-28) -3.1%
Width inches (mm) 12.4 (315) 11.61 (295) -0.79 (-20) -6.3%
Circum. inches (mm) 111.09 (2821.78) 107.63 (2733.81) -3.46 (-87.96) -3.1%
Sidewall Height inches (mm) 8.68 (220.5) 8.13 (206.5) -0.55 (-14) -6.3%
Revolutions per mile (km) 570.33 (354.39) 588.68 (365.79) 18.35 (11.4) 3.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.38 mph (31.18 km/h)
25 mph (40.23 km/h)24.22 mph (38.98 km/h)
30 mph (48.28 km/h)29.06 mph (46.78 km/h)
35 mph (56.33 km/h)33.91 mph (54.57 km/h)
40 mph (64.37 km/h)38.75 mph (62.37 km/h)
45 mph (72.42 km/h)43.6 mph (70.16 km/h)
50 mph (80.47 km/h)48.44 mph (77.96 km/h)
55 mph (88.51 km/h)53.29 mph (85.75 km/h)
60 mph (96.56 km/h)58.13 mph (93.55 km/h)
65 mph (104.61 km/h)62.97 mph (101.35 km/h)
70 mph (112.65 km/h)67.82 mph (109.14 km/h)
75 mph (120.7 km/h)72.66 mph (116.94 km/h)
80 mph (128.75 km/h)77.51 mph (124.73 km/h)
85 mph (136.79 km/h)82.35 mph (132.53 km/h)
90 mph (144.84 km/h)87.19 mph (140.33 km/h)
95 mph (152.89 km/h)92.04 mph (148.12 km/h)
100 mph (160.93 km/h)96.88 mph (155.92 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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