Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
180/80r14 vs 205/65r16 Tire Comparison Side By Side
  180/80-14 205/65-16 Difference
Diameter inches (mm) 25.34 (643.6) 26.49 (672.9) 1.15 (29.3) 4.6%
Width inches (mm) 7.09 (180) 8.07 (205) 0.98 (25) 13.9%
Circum. inches (mm) 79.6 (2021.93) 83.23 (2113.98) 3.62 (92.05) 4.6%
Sidewall Height inches (mm) 5.67 (144) 5.25 (133.25) -0.42 (-10.75) -7.5%
Revolutions per mile (km) 795.94 (494.58) 761.29 (473.04) -34.66 (-21.54) -4.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.91 mph (33.65 km/h)
25 mph (40.23 km/h)26.14 mph (42.07 km/h)
30 mph (48.28 km/h)31.37 mph (50.48 km/h)
35 mph (56.33 km/h)36.59 mph (58.89 km/h)
40 mph (64.37 km/h)41.82 mph (67.3 km/h)
45 mph (72.42 km/h)47.05 mph (75.72 km/h)
50 mph (80.47 km/h)52.28 mph (84.13 km/h)
55 mph (88.51 km/h)57.5 mph (92.54 km/h)
60 mph (96.56 km/h)62.73 mph (100.96 km/h)
65 mph (104.61 km/h)67.96 mph (109.37 km/h)
70 mph (112.65 km/h)73.19 mph (117.78 km/h)
75 mph (120.7 km/h)78.41 mph (126.2 km/h)
80 mph (128.75 km/h)83.64 mph (134.61 km/h)
85 mph (136.79 km/h)88.87 mph (143.02 km/h)
90 mph (144.84 km/h)94.1 mph (151.44 km/h)
95 mph (152.89 km/h)99.32 mph (159.85 km/h)
100 mph (160.93 km/h)104.55 mph (168.26 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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