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 205/60r15 Tire Comparison Side By Side
  185/60-15 205/60-15 Difference
Diameter inches (mm) 23.74 (603) 24.69 (627) 0.94 (24) 4%
Width inches (mm) 7.28 (185) 8.07 (205) 0.79 (20) 10.8%
Circum. inches (mm) 74.58 (1894.38) 77.55 (1969.78) 2.97 (75.4) 4%
Sidewall Height inches (mm) 4.37 (111) 4.84 (123) 0.47 (12) 10.8%
Revolutions per mile (km) 849.54 (527.88) 817.02 (507.67) -32.52 (-20.21) -3.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.8 mph (33.47 km/h)
25 mph (40.23 km/h)26 mph (41.84 km/h)
30 mph (48.28 km/h)31.19 mph (50.2 km/h)
35 mph (56.33 km/h)36.39 mph (58.57 km/h)
40 mph (64.37 km/h)41.59 mph (66.94 km/h)
45 mph (72.42 km/h)46.79 mph (75.3 km/h)
50 mph (80.47 km/h)51.99 mph (83.67 km/h)
55 mph (88.51 km/h)57.19 mph (92.04 km/h)
60 mph (96.56 km/h)62.39 mph (100.4 km/h)
65 mph (104.61 km/h)67.59 mph (108.77 km/h)
70 mph (112.65 km/h)72.79 mph (117.14 km/h)
75 mph (120.7 km/h)77.99 mph (125.51 km/h)
80 mph (128.75 km/h)83.18 mph (133.87 km/h)
85 mph (136.79 km/h)88.38 mph (142.24 km/h)
90 mph (144.84 km/h)93.58 mph (150.61 km/h)
95 mph (152.89 km/h)98.78 mph (158.97 km/h)
100 mph (160.93 km/h)103.98 mph (167.34 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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