Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
185/80r15 vs 205/75r15 Tire Comparison Side By Side
  185/80-15 205/75-15 Difference
Diameter inches (mm) 26.65 (677) 27.11 (688.5) 0.45 (11.5) 1.7%
Width inches (mm) 7.28 (185) 8.07 (205) 0.79 (20) 10.8%
Circum. inches (mm) 83.73 (2126.86) 85.16 (2162.99) 1.42 (36.13) 1.7%
Sidewall Height inches (mm) 5.83 (148) 6.05 (153.75) 0.23 (5.75) 3.9%
Revolutions per mile (km) 756.68 (470.18) 744.04 (462.32) -12.64 (-7.85) -1.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.34 mph (32.73 km/h)
25 mph (40.23 km/h)25.42 mph (40.92 km/h)
30 mph (48.28 km/h)30.51 mph (49.1 km/h)
35 mph (56.33 km/h)35.59 mph (57.28 km/h)
40 mph (64.37 km/h)40.68 mph (65.47 km/h)
45 mph (72.42 km/h)45.76 mph (73.65 km/h)
50 mph (80.47 km/h)50.85 mph (81.83 km/h)
55 mph (88.51 km/h)55.93 mph (90.02 km/h)
60 mph (96.56 km/h)61.02 mph (98.2 km/h)
65 mph (104.61 km/h)66.1 mph (106.38 km/h)
70 mph (112.65 km/h)71.19 mph (114.57 km/h)
75 mph (120.7 km/h)76.27 mph (122.75 km/h)
80 mph (128.75 km/h)81.36 mph (130.93 km/h)
85 mph (136.79 km/h)86.44 mph (139.12 km/h)
90 mph (144.84 km/h)91.53 mph (147.3 km/h)
95 mph (152.89 km/h)96.61 mph (155.49 km/h)
100 mph (160.93 km/h)101.7 mph (163.67 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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