Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
225/60r15 vs 205/65r15 Tire Comparison Side By Side
  225/60-15 205/65-15 Difference
Diameter inches (mm) 25.63 (651) 25.49 (647.5) -0.14 (-3.5) -0.5%
Width inches (mm) 8.86 (225) 8.07 (205) -0.79 (-20) -8.9%
Circum. inches (mm) 80.52 (2045.18) 80.09 (2034.18) -0.43 (-11) -0.5%
Sidewall Height inches (mm) 5.31 (135) 5.25 (133.25) -0.07 (-1.75) -1.3%
Revolutions per mile (km) 786.9 (488.95) 791.15 (491.6) 4.25 (2.64) 0.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.89 mph (32.01 km/h)
25 mph (40.23 km/h)24.87 mph (40.02 km/h)
30 mph (48.28 km/h)29.84 mph (48.02 km/h)
35 mph (56.33 km/h)34.81 mph (56.02 km/h)
40 mph (64.37 km/h)39.78 mph (64.03 km/h)
45 mph (72.42 km/h)44.76 mph (72.03 km/h)
50 mph (80.47 km/h)49.73 mph (80.03 km/h)
55 mph (88.51 km/h)54.7 mph (88.04 km/h)
60 mph (96.56 km/h)59.68 mph (96.04 km/h)
65 mph (104.61 km/h)64.65 mph (104.05 km/h)
70 mph (112.65 km/h)69.62 mph (112.05 km/h)
75 mph (120.7 km/h)74.6 mph (120.05 km/h)
80 mph (128.75 km/h)79.57 mph (128.06 km/h)
85 mph (136.79 km/h)84.54 mph (136.06 km/h)
90 mph (144.84 km/h)89.52 mph (144.06 km/h)
95 mph (152.89 km/h)94.49 mph (152.07 km/h)
100 mph (160.93 km/h)99.46 mph (160.07 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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