Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
165/80r17 vs 235/45r19 Tire Comparison Side By Side
  165/80-17 235/45-19 Difference
Diameter inches (mm) 27.39 (695.8) 27.33 (694.1) -0.07 (-1.7) -0.2%
Width inches (mm) 6.5 (165) 9.25 (235) 2.76 (70) 42.4%
Circum. inches (mm) 86.06 (2185.92) 85.85 (2180.58) -0.21 (-5.34) -0.2%
Sidewall Height inches (mm) 5.2 (132) 4.16 (105.75) -1.03 (-26.25) -19.9%
Revolutions per mile (km) 736.23 (457.47) 738.04 (458.59) 1.8 (1.12) 0.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.95 mph (32.11 km/h)
25 mph (40.23 km/h)24.94 mph (40.14 km/h)
30 mph (48.28 km/h)29.93 mph (48.16 km/h)
35 mph (56.33 km/h)34.91 mph (56.19 km/h)
40 mph (64.37 km/h)39.9 mph (64.22 km/h)
45 mph (72.42 km/h)44.89 mph (72.24 km/h)
50 mph (80.47 km/h)49.88 mph (80.27 km/h)
55 mph (88.51 km/h)54.87 mph (88.3 km/h)
60 mph (96.56 km/h)59.85 mph (96.32 km/h)
65 mph (104.61 km/h)64.84 mph (104.35 km/h)
70 mph (112.65 km/h)69.83 mph (112.38 km/h)
75 mph (120.7 km/h)74.82 mph (120.41 km/h)
80 mph (128.75 km/h)79.8 mph (128.43 km/h)
85 mph (136.79 km/h)84.79 mph (136.46 km/h)
90 mph (144.84 km/h)89.78 mph (144.49 km/h)
95 mph (152.89 km/h)94.77 mph (152.51 km/h)
100 mph (160.93 km/h)99.76 mph (160.54 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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