Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
325/60r15 vs 315/60r17 Tire Comparison Side By Side
  325/60-15 315/60-17 Difference
Diameter inches (mm) 30.35 (771) 31.88 (809.8) 1.53 (38.8) 5%
Width inches (mm) 12.8 (325) 12.4 (315) -0.39 (-10) -3.1%
Circum. inches (mm) 95.36 (2422.17) 100.16 (2544.06) 4.8 (121.89) 5%
Sidewall Height inches (mm) 7.68 (195) 7.44 (189) -0.24 (-6) -3.1%
Revolutions per mile (km) 664.42 (412.85) 632.59 (393.07) -31.83 (-19.78) -4.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.01 mph (33.81 km/h)
25 mph (40.23 km/h)26.26 mph (42.26 km/h)
30 mph (48.28 km/h)31.51 mph (50.71 km/h)
35 mph (56.33 km/h)36.76 mph (59.16 km/h)
40 mph (64.37 km/h)42.01 mph (67.61 km/h)
45 mph (72.42 km/h)47.26 mph (76.07 km/h)
50 mph (80.47 km/h)52.52 mph (84.52 km/h)
55 mph (88.51 km/h)57.77 mph (92.97 km/h)
60 mph (96.56 km/h)63.02 mph (101.42 km/h)
65 mph (104.61 km/h)68.27 mph (109.87 km/h)
70 mph (112.65 km/h)73.52 mph (118.32 km/h)
75 mph (120.7 km/h)78.77 mph (126.78 km/h)
80 mph (128.75 km/h)84.03 mph (135.23 km/h)
85 mph (136.79 km/h)89.28 mph (143.68 km/h)
90 mph (144.84 km/h)94.53 mph (152.13 km/h)
95 mph (152.89 km/h)99.78 mph (160.58 km/h)
100 mph (160.93 km/h)105.03 mph (169.03 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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