Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
155/70r17 vs 135/80r17 Tire Comparison Side By Side
  155/70-17 135/80-17 Difference
Diameter inches (mm) 25.54 (648.8) 25.5 (647.8) -0.04 (-1) -0.2%
Width inches (mm) 6.1 (155) 5.31 (135) -0.79 (-20) -12.9%
Circum. inches (mm) 80.25 (2038.27) 80.12 (2035.12) -0.12 (-3.14) -0.2%
Sidewall Height inches (mm) 4.27 (108.5) 4.25 (108) -0.02 (-0.5) -0.5%
Revolutions per mile (km) 789.57 (490.61) 790.78 (491.37) 1.22 (0.76) 0.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.97 mph (32.14 km/h)
25 mph (40.23 km/h)24.96 mph (40.17 km/h)
30 mph (48.28 km/h)29.95 mph (48.21 km/h)
35 mph (56.33 km/h)34.95 mph (56.24 km/h)
40 mph (64.37 km/h)39.94 mph (64.27 km/h)
45 mph (72.42 km/h)44.93 mph (72.31 km/h)
50 mph (80.47 km/h)49.92 mph (80.34 km/h)
55 mph (88.51 km/h)54.92 mph (88.38 km/h)
60 mph (96.56 km/h)59.91 mph (96.41 km/h)
65 mph (104.61 km/h)64.9 mph (104.45 km/h)
70 mph (112.65 km/h)69.89 mph (112.48 km/h)
75 mph (120.7 km/h)74.88 mph (120.51 km/h)
80 mph (128.75 km/h)79.88 mph (128.55 km/h)
85 mph (136.79 km/h)84.87 mph (136.58 km/h)
90 mph (144.84 km/h)89.86 mph (144.62 km/h)
95 mph (152.89 km/h)94.85 mph (152.65 km/h)
100 mph (160.93 km/h)99.85 mph (160.69 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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