Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
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/ R
165/80r13 vs 165/65r15 Tire Comparison Side By Side
  165/80-13 165/65-15 Difference
Diameter inches (mm) 23.39 (594.2) 23.44 (595.5) 0.05 (1.3) 0.2%
Width inches (mm) 6.5 (165) 6.5 (165) 0 (0) 0%
Circum. inches (mm) 73.49 (1866.73) 73.65 (1870.82) 0.16 (4.08) 0.2%
Sidewall Height inches (mm) 5.2 (132) 4.22 (107.25) -0.97 (-24.75) -18.8%
Revolutions per mile (km) 862.12 (535.69) 860.24 (534.52) -1.88 (-1.17) -0.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.04 mph (32.26 km/h)
25 mph (40.23 km/h)25.05 mph (40.32 km/h)
30 mph (48.28 km/h)30.07 mph (48.39 km/h)
35 mph (56.33 km/h)35.08 mph (56.45 km/h)
40 mph (64.37 km/h)40.09 mph (64.51 km/h)
45 mph (72.42 km/h)45.1 mph (72.58 km/h)
50 mph (80.47 km/h)50.11 mph (80.64 km/h)
55 mph (88.51 km/h)55.12 mph (88.71 km/h)
60 mph (96.56 km/h)60.13 mph (96.77 km/h)
65 mph (104.61 km/h)65.14 mph (104.84 km/h)
70 mph (112.65 km/h)70.15 mph (112.9 km/h)
75 mph (120.7 km/h)75.16 mph (120.97 km/h)
80 mph (128.75 km/h)80.18 mph (129.03 km/h)
85 mph (136.79 km/h)85.19 mph (137.09 km/h)
90 mph (144.84 km/h)90.2 mph (145.16 km/h)
95 mph (152.89 km/h)95.21 mph (153.22 km/h)
100 mph (160.93 km/h)100.22 mph (161.29 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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