Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
185/85r14 vs 185/80r15 Tire Comparison Side By Side
  185/85-14 185/80-15 Difference
Diameter inches (mm) 26.38 (670.1) 26.65 (677) 0.27 (6.9) 1%
Width inches (mm) 7.28 (185) 7.28 (185) 0 (0) 0%
Circum. inches (mm) 82.88 (2105.18) 83.73 (2126.86) 0.85 (21.68) 1%
Sidewall Height inches (mm) 6.19 (157.25) 5.83 (148) -0.36 (-9.25) -5.9%
Revolutions per mile (km) 764.47 (475.02) 756.68 (470.18) -7.79 (-4.84) -1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.21 mph (32.52 km/h)
25 mph (40.23 km/h)25.26 mph (40.65 km/h)
30 mph (48.28 km/h)30.31 mph (48.78 km/h)
35 mph (56.33 km/h)35.36 mph (56.91 km/h)
40 mph (64.37 km/h)40.41 mph (65.04 km/h)
45 mph (72.42 km/h)45.46 mph (73.17 km/h)
50 mph (80.47 km/h)50.51 mph (81.3 km/h)
55 mph (88.51 km/h)55.57 mph (89.43 km/h)
60 mph (96.56 km/h)60.62 mph (97.56 km/h)
65 mph (104.61 km/h)65.67 mph (105.68 km/h)
70 mph (112.65 km/h)70.72 mph (113.81 km/h)
75 mph (120.7 km/h)75.77 mph (121.94 km/h)
80 mph (128.75 km/h)80.82 mph (130.07 km/h)
85 mph (136.79 km/h)85.88 mph (138.2 km/h)
90 mph (144.84 km/h)90.93 mph (146.33 km/h)
95 mph (152.89 km/h)95.98 mph (154.46 km/h)
100 mph (160.93 km/h)101.03 mph (162.59 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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