Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
205/60r13 vs 225/45r13 Tire Comparison Side By Side
  205/60-13 225/45-13 Difference
Diameter inches (mm) 22.69 (576.2) 20.97 (532.7) -1.71 (-43.5) -7.5%
Width inches (mm) 8.07 (205) 8.86 (225) 0.79 (20) 9.8%
Circum. inches (mm) 71.27 (1810.19) 65.89 (1673.53) -5.38 (-136.66) -7.5%
Sidewall Height inches (mm) 4.84 (123) 3.99 (101.25) -0.86 (-21.75) -17.7%
Revolutions per mile (km) 889.05 (552.43) 961.65 (597.54) 72.6 (45.11) 8.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.49 mph (29.76 km/h)
25 mph (40.23 km/h)23.11 mph (37.2 km/h)
30 mph (48.28 km/h)27.74 mph (44.64 km/h)
35 mph (56.33 km/h)32.36 mph (52.07 km/h)
40 mph (64.37 km/h)36.98 mph (59.51 km/h)
45 mph (72.42 km/h)41.6 mph (66.95 km/h)
50 mph (80.47 km/h)46.23 mph (74.39 km/h)
55 mph (88.51 km/h)50.85 mph (81.83 km/h)
60 mph (96.56 km/h)55.47 mph (89.27 km/h)
65 mph (104.61 km/h)60.09 mph (96.71 km/h)
70 mph (112.65 km/h)64.72 mph (104.15 km/h)
75 mph (120.7 km/h)69.34 mph (111.59 km/h)
80 mph (128.75 km/h)73.96 mph (119.03 km/h)
85 mph (136.79 km/h)78.58 mph (126.47 km/h)
90 mph (144.84 km/h)83.21 mph (133.91 km/h)
95 mph (152.89 km/h)87.83 mph (141.35 km/h)
100 mph (160.93 km/h)92.45 mph (148.79 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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