Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
155/80r19 vs 235/65r17 Tire Comparison Side By Side
  155/80-19 235/65-17 Difference
Diameter inches (mm) 28.76 (730.6) 29.03 (737.3) 0.26 (6.7) 0.9%
Width inches (mm) 6.1 (155) 9.25 (235) 3.15 (80) 51.6%
Circum. inches (mm) 90.36 (2295.25) 91.19 (2316.3) 0.83 (21.05) 0.9%
Sidewall Height inches (mm) 4.88 (124) 6.01 (152.75) 1.13 (28.75) 23.2%
Revolutions per mile (km) 701.16 (435.68) 694.79 (431.72) -6.37 (-3.96) -0.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.18 mph (32.48 km/h)
25 mph (40.23 km/h)25.23 mph (40.6 km/h)
30 mph (48.28 km/h)30.28 mph (48.72 km/h)
35 mph (56.33 km/h)35.32 mph (56.84 km/h)
40 mph (64.37 km/h)40.37 mph (64.96 km/h)
45 mph (72.42 km/h)45.41 mph (73.08 km/h)
50 mph (80.47 km/h)50.46 mph (81.21 km/h)
55 mph (88.51 km/h)55.5 mph (89.33 km/h)
60 mph (96.56 km/h)60.55 mph (97.45 km/h)
65 mph (104.61 km/h)65.6 mph (105.57 km/h)
70 mph (112.65 km/h)70.64 mph (113.69 km/h)
75 mph (120.7 km/h)75.69 mph (121.81 km/h)
80 mph (128.75 km/h)80.73 mph (129.93 km/h)
85 mph (136.79 km/h)85.78 mph (138.05 km/h)
90 mph (144.84 km/h)90.83 mph (146.17 km/h)
95 mph (152.89 km/h)95.87 mph (154.29 km/h)
100 mph (160.93 km/h)100.92 mph (162.41 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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