Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
275/60r17 vs 275/60r20 Tire Comparison Side By Side
  275/60-17 275/60-20 Difference
Diameter inches (mm) 29.99 (761.8) 32.99 (838) 3 (76.2) 10%
Width inches (mm) 10.83 (275) 10.83 (275) 0 (0) 0%
Circum. inches (mm) 94.22 (2393.27) 103.65 (2632.65) 9.42 (239.39) 10%
Sidewall Height inches (mm) 6.5 (165) 6.5 (165) 0 (0) 0%
Revolutions per mile (km) 672.45 (417.84) 611.3 (379.84) -61.15 (-37.99) -9.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)22 mph (35.41 km/h)
25 mph (40.23 km/h)27.5 mph (44.26 km/h)
30 mph (48.28 km/h)33 mph (53.11 km/h)
35 mph (56.33 km/h)38.5 mph (61.96 km/h)
40 mph (64.37 km/h)44 mph (70.81 km/h)
45 mph (72.42 km/h)49.5 mph (79.66 km/h)
50 mph (80.47 km/h)55 mph (88.52 km/h)
55 mph (88.51 km/h)60.5 mph (97.37 km/h)
60 mph (96.56 km/h)66 mph (106.22 km/h)
65 mph (104.61 km/h)71.5 mph (115.07 km/h)
70 mph (112.65 km/h)77 mph (123.92 km/h)
75 mph (120.7 km/h)82.5 mph (132.77 km/h)
80 mph (128.75 km/h)88 mph (141.63 km/h)
85 mph (136.79 km/h)93.5 mph (150.48 km/h)
90 mph (144.84 km/h)99 mph (159.33 km/h)
95 mph (152.89 km/h)104.5 mph (168.18 km/h)
100 mph (160.93 km/h)110 mph (177.03 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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