Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
220/70r14 vs 270/75r14 Tire Comparison Side By Side
  220/70-14 270/75-14 Difference
Diameter inches (mm) 26.13 (663.6) 29.94 (760.6) 3.82 (97) 14.6%
Width inches (mm) 8.66 (220) 10.63 (270) 1.97 (50) 22.7%
Circum. inches (mm) 82.08 (2084.76) 94.07 (2389.5) 12 (304.73) 14.6%
Sidewall Height inches (mm) 6.06 (154) 7.97 (202.5) 1.91 (48.5) 31.5%
Revolutions per mile (km) 771.96 (479.67) 673.51 (418.5) -98.45 (-61.17) -12.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)22.92 mph (36.89 km/h)
25 mph (40.23 km/h)28.65 mph (46.11 km/h)
30 mph (48.28 km/h)34.39 mph (55.34 km/h)
35 mph (56.33 km/h)40.12 mph (64.56 km/h)
40 mph (64.37 km/h)45.85 mph (73.78 km/h)
45 mph (72.42 km/h)51.58 mph (83.01 km/h)
50 mph (80.47 km/h)57.31 mph (92.23 km/h)
55 mph (88.51 km/h)63.04 mph (101.45 km/h)
60 mph (96.56 km/h)68.77 mph (110.68 km/h)
65 mph (104.61 km/h)74.5 mph (119.9 km/h)
70 mph (112.65 km/h)80.23 mph (129.12 km/h)
75 mph (120.7 km/h)85.96 mph (138.34 km/h)
80 mph (128.75 km/h)91.69 mph (147.57 km/h)
85 mph (136.79 km/h)97.42 mph (156.79 km/h)
90 mph (144.84 km/h)103.16 mph (166.01 km/h)
95 mph (152.89 km/h)108.89 mph (175.24 km/h)
100 mph (160.93 km/h)114.62 mph (184.46 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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