Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
135/80r13 vs 165/65r13 Tire Comparison Side By Side
  135/80-13 165/65-13 Difference
Diameter inches (mm) 21.5 (546.2) 21.44 (544.7) -0.06 (-1.5) -0.3%
Width inches (mm) 5.31 (135) 6.5 (165) 1.18 (30) 22.2%
Circum. inches (mm) 67.56 (1715.94) 67.37 (1711.23) -0.19 (-4.71) -0.3%
Sidewall Height inches (mm) 4.25 (108) 4.22 (107.25) -0.03 (-0.75) -0.7%
Revolutions per mile (km) 937.88 (582.77) 940.46 (584.38) 2.58 (1.6) 0.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.95 mph (32.1 km/h)
25 mph (40.23 km/h)24.93 mph (40.12 km/h)
30 mph (48.28 km/h)29.92 mph (48.15 km/h)
35 mph (56.33 km/h)34.9 mph (56.17 km/h)
40 mph (64.37 km/h)39.89 mph (64.2 km/h)
45 mph (72.42 km/h)44.88 mph (72.22 km/h)
50 mph (80.47 km/h)49.86 mph (80.25 km/h)
55 mph (88.51 km/h)54.85 mph (88.27 km/h)
60 mph (96.56 km/h)59.84 mph (96.3 km/h)
65 mph (104.61 km/h)64.82 mph (104.32 km/h)
70 mph (112.65 km/h)69.81 mph (112.34 km/h)
75 mph (120.7 km/h)74.79 mph (120.37 km/h)
80 mph (128.75 km/h)79.78 mph (128.39 km/h)
85 mph (136.79 km/h)84.77 mph (136.42 km/h)
90 mph (144.84 km/h)89.75 mph (144.44 km/h)
95 mph (152.89 km/h)94.74 mph (152.47 km/h)
100 mph (160.93 km/h)99.73 mph (160.49 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
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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