Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
365/65r16 vs 315/75r16 Tire Comparison Side By Side
  365/65-16 315/75-16 Difference
Diameter inches (mm) 34.68 (880.9) 34.6 (878.9) -0.08 (-2) -0.2%
Width inches (mm) 14.37 (365) 12.4 (315) -1.97 (-50) -13.7%
Circum. inches (mm) 108.95 (2767.43) 108.71 (2761.15) -0.25 (-6.28) -0.2%
Sidewall Height inches (mm) 9.34 (237.25) 9.3 (236.25) -0.04 (-1) -0.4%
Revolutions per mile (km) 581.53 (361.35) 582.85 (362.17) 1.32 (0.82) 0.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.95 mph (32.11 km/h)
25 mph (40.23 km/h)24.94 mph (40.14 km/h)
30 mph (48.28 km/h)29.93 mph (48.17 km/h)
35 mph (56.33 km/h)34.92 mph (56.2 km/h)
40 mph (64.37 km/h)39.91 mph (64.23 km/h)
45 mph (72.42 km/h)44.9 mph (72.26 km/h)
50 mph (80.47 km/h)49.89 mph (80.28 km/h)
55 mph (88.51 km/h)54.88 mph (88.31 km/h)
60 mph (96.56 km/h)59.86 mph (96.34 km/h)
65 mph (104.61 km/h)64.85 mph (104.37 km/h)
70 mph (112.65 km/h)69.84 mph (112.4 km/h)
75 mph (120.7 km/h)74.83 mph (120.43 km/h)
80 mph (128.75 km/h)79.82 mph (128.46 km/h)
85 mph (136.79 km/h)84.81 mph (136.48 km/h)
90 mph (144.84 km/h)89.8 mph (144.51 km/h)
95 mph (152.89 km/h)94.78 mph (152.54 km/h)
100 mph (160.93 km/h)99.77 mph (160.57 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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