Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
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205/60r13 vs 185/60r13 Tire Comparison Side By Side
  205/60-13 185/60-13 Difference
Diameter inches (mm) 22.69 (576.2) 21.74 (552.2) -0.94 (-24) -4.2%
Width inches (mm) 8.07 (205) 7.28 (185) -0.79 (-20) -9.8%
Circum. inches (mm) 71.27 (1810.19) 68.3 (1734.79) -2.97 (-75.4) -4.2%
Sidewall Height inches (mm) 4.84 (123) 4.37 (111) -0.47 (-12) -9.8%
Revolutions per mile (km) 889.05 (552.43) 927.69 (576.44) 38.64 (24.01) 4.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.17 mph (30.85 km/h)
25 mph (40.23 km/h)23.96 mph (38.56 km/h)
30 mph (48.28 km/h)28.75 mph (46.27 km/h)
35 mph (56.33 km/h)33.54 mph (53.98 km/h)
40 mph (64.37 km/h)38.33 mph (61.69 km/h)
45 mph (72.42 km/h)43.13 mph (69.4 km/h)
50 mph (80.47 km/h)47.92 mph (77.12 km/h)
55 mph (88.51 km/h)52.71 mph (84.83 km/h)
60 mph (96.56 km/h)57.5 mph (92.54 km/h)
65 mph (104.61 km/h)62.29 mph (100.25 km/h)
70 mph (112.65 km/h)67.08 mph (107.96 km/h)
75 mph (120.7 km/h)71.88 mph (115.67 km/h)
80 mph (128.75 km/h)76.67 mph (123.39 km/h)
85 mph (136.79 km/h)81.46 mph (131.1 km/h)
90 mph (144.84 km/h)86.25 mph (138.81 km/h)
95 mph (152.89 km/h)91.04 mph (146.52 km/h)
100 mph (160.93 km/h)95.83 mph (154.23 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
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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