Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
205/80r12 vs 26/9r14 Tire Comparison Side By Side
  205/80-12 26/9-14 Difference
Diameter inches (mm) 24.91 (632.8) 26.08 (662.46) 1.17 (29.66) 4.7%
Width inches (mm) 8.07 (205) 9.02 (229) 0.94 (24) 11.7%
Circum. inches (mm) 78.27 (1988) 81.94 (2081.18) 3.67 (93.18) 4.7%
Sidewall Height inches (mm) 6.46 (164) 6.04 (153.43) -0.42 (-10.57) -6.4%
Revolutions per mile (km) 809.53 (503.02) 773.28 (480.5) -36.24 (-22.52) -4.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.94 mph (33.7 km/h)
25 mph (40.23 km/h)26.17 mph (42.12 km/h)
30 mph (48.28 km/h)31.41 mph (50.54 km/h)
35 mph (56.33 km/h)36.64 mph (58.97 km/h)
40 mph (64.37 km/h)41.87 mph (67.39 km/h)
45 mph (72.42 km/h)47.11 mph (75.82 km/h)
50 mph (80.47 km/h)52.34 mph (84.24 km/h)
55 mph (88.51 km/h)57.58 mph (92.66 km/h)
60 mph (96.56 km/h)62.81 mph (101.09 km/h)
65 mph (104.61 km/h)68.05 mph (109.51 km/h)
70 mph (112.65 km/h)73.28 mph (117.93 km/h)
75 mph (120.7 km/h)78.52 mph (126.36 km/h)
80 mph (128.75 km/h)83.75 mph (134.78 km/h)
85 mph (136.79 km/h)88.98 mph (143.21 km/h)
90 mph (144.84 km/h)94.22 mph (151.63 km/h)
95 mph (152.89 km/h)99.45 mph (160.05 km/h)
100 mph (160.93 km/h)104.69 mph (168.48 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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