Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
205/80r15 vs 205/75r15 Tire Comparison Side By Side
  205/80-15 205/75-15 Difference
Diameter inches (mm) 27.91 (709) 27.11 (688.5) -0.81 (-20.5) -2.9%
Width inches (mm) 8.07 (205) 8.07 (205) 0 (0) 0%
Circum. inches (mm) 87.69 (2227.39) 85.16 (2162.99) -2.54 (-64.4) -2.9%
Sidewall Height inches (mm) 6.46 (164) 6.05 (153.75) -0.4 (-10.25) -6.2%
Revolutions per mile (km) 722.52 (448.96) 744.04 (462.32) 21.51 (13.37) 3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.42 mph (31.26 km/h)
25 mph (40.23 km/h)24.28 mph (39.07 km/h)
30 mph (48.28 km/h)29.13 mph (46.88 km/h)
35 mph (56.33 km/h)33.99 mph (54.7 km/h)
40 mph (64.37 km/h)38.84 mph (62.51 km/h)
45 mph (72.42 km/h)43.7 mph (70.33 km/h)
50 mph (80.47 km/h)48.55 mph (78.14 km/h)
55 mph (88.51 km/h)53.41 mph (85.95 km/h)
60 mph (96.56 km/h)58.27 mph (93.77 km/h)
65 mph (104.61 km/h)63.12 mph (101.58 km/h)
70 mph (112.65 km/h)67.98 mph (109.4 km/h)
75 mph (120.7 km/h)72.83 mph (117.21 km/h)
80 mph (128.75 km/h)77.69 mph (125.03 km/h)
85 mph (136.79 km/h)82.54 mph (132.84 km/h)
90 mph (144.84 km/h)87.4 mph (140.65 km/h)
95 mph (152.89 km/h)92.25 mph (148.47 km/h)
100 mph (160.93 km/h)97.11 mph (156.28 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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