Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
275/70r20 vs 35/12.5r20 Tire Comparison Side By Side
  275/70-20 35/12.5-20 Difference
Diameter inches (mm) 35.16 (893) 35.02 (889.6) -0.13 (-3.4) -0.4%
Width inches (mm) 10.83 (275) 12.52 (318) 1.69 (43) 15.6%
Circum. inches (mm) 110.45 (2805.44) 110.03 (2794.76) -0.42 (-10.68) -0.4%
Sidewall Height inches (mm) 7.58 (192.5) 7.51 (190.8) -0.07 (-1.7) -0.9%
Revolutions per mile (km) 573.65 (356.45) 575.84 (357.81) 2.19 (1.36) 0.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.92 mph (32.06 km/h)
25 mph (40.23 km/h)24.9 mph (40.08 km/h)
30 mph (48.28 km/h)29.89 mph (48.1 km/h)
35 mph (56.33 km/h)34.87 mph (56.11 km/h)
40 mph (64.37 km/h)39.85 mph (64.13 km/h)
45 mph (72.42 km/h)44.83 mph (72.14 km/h)
50 mph (80.47 km/h)49.81 mph (80.16 km/h)
55 mph (88.51 km/h)54.79 mph (88.18 km/h)
60 mph (96.56 km/h)59.77 mph (96.19 km/h)
65 mph (104.61 km/h)64.75 mph (104.21 km/h)
70 mph (112.65 km/h)69.73 mph (112.23 km/h)
75 mph (120.7 km/h)74.71 mph (120.24 km/h)
80 mph (128.75 km/h)79.7 mph (128.26 km/h)
85 mph (136.79 km/h)84.68 mph (136.27 km/h)
90 mph (144.84 km/h)89.66 mph (144.29 km/h)
95 mph (152.89 km/h)94.64 mph (152.31 km/h)
100 mph (160.93 km/h)99.62 mph (160.32 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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