Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
225/60r13 vs 205/60r13 Tire Comparison Side By Side
  225/60-13 205/60-13 Difference
Diameter inches (mm) 23.63 (600.2) 22.69 (576.2) -0.94 (-24) -4%
Width inches (mm) 8.86 (225) 8.07 (205) -0.79 (-20) -8.9%
Circum. inches (mm) 74.24 (1885.58) 71.27 (1810.19) -2.97 (-75.4) -4%
Sidewall Height inches (mm) 5.31 (135) 4.84 (123) -0.47 (-12) -8.9%
Revolutions per mile (km) 853.5 (530.34) 889.05 (552.43) 35.55 (22.09) 4.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.2 mph (30.9 km/h)
25 mph (40.23 km/h)24 mph (38.62 km/h)
30 mph (48.28 km/h)28.8 mph (46.35 km/h)
35 mph (56.33 km/h)33.6 mph (54.07 km/h)
40 mph (64.37 km/h)38.4 mph (61.8 km/h)
45 mph (72.42 km/h)43.2 mph (69.52 km/h)
50 mph (80.47 km/h)48 mph (77.25 km/h)
55 mph (88.51 km/h)52.8 mph (84.97 km/h)
60 mph (96.56 km/h)57.6 mph (92.7 km/h)
65 mph (104.61 km/h)62.4 mph (100.42 km/h)
70 mph (112.65 km/h)67.2 mph (108.15 km/h)
75 mph (120.7 km/h)72 mph (115.87 km/h)
80 mph (128.75 km/h)76.8 mph (123.6 km/h)
85 mph (136.79 km/h)81.6 mph (131.32 km/h)
90 mph (144.84 km/h)86.4 mph (139.05 km/h)
95 mph (152.89 km/h)91.2 mph (146.77 km/h)
100 mph (160.93 km/h)96 mph (154.5 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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