Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
185/60r15 vs 205/55r16 Tire Comparison Side By Side
  185/60-15 205/55-16 Difference
Diameter inches (mm) 23.74 (603) 24.88 (631.9) 1.14 (28.9) 4.8%
Width inches (mm) 7.28 (185) 8.07 (205) 0.79 (20) 10.8%
Circum. inches (mm) 74.58 (1894.38) 78.16 (1985.17) 3.57 (90.79) 4.8%
Sidewall Height inches (mm) 4.37 (111) 4.44 (112.75) 0.07 (1.75) 1.6%
Revolutions per mile (km) 849.54 (527.88) 810.68 (503.73) -38.85 (-24.14) -4.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.96 mph (33.73 km/h)
25 mph (40.23 km/h)26.2 mph (42.16 km/h)
30 mph (48.28 km/h)31.44 mph (50.59 km/h)
35 mph (56.33 km/h)36.68 mph (59.03 km/h)
40 mph (64.37 km/h)41.92 mph (67.46 km/h)
45 mph (72.42 km/h)47.16 mph (75.89 km/h)
50 mph (80.47 km/h)52.4 mph (84.32 km/h)
55 mph (88.51 km/h)57.64 mph (92.76 km/h)
60 mph (96.56 km/h)62.88 mph (101.19 km/h)
65 mph (104.61 km/h)68.12 mph (109.62 km/h)
70 mph (112.65 km/h)73.35 mph (118.05 km/h)
75 mph (120.7 km/h)78.59 mph (126.49 km/h)
80 mph (128.75 km/h)83.83 mph (134.92 km/h)
85 mph (136.79 km/h)89.07 mph (143.35 km/h)
90 mph (144.84 km/h)94.31 mph (151.78 km/h)
95 mph (152.89 km/h)99.55 mph (160.22 km/h)
100 mph (160.93 km/h)104.79 mph (168.65 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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