Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
225/70r14 vs 205/70r15 Tire Comparison Side By Side
  225/70-14 205/70-15 Difference
Diameter inches (mm) 26.4 (670.6) 26.3 (668) -0.1 (-2.6) -0.4%
Width inches (mm) 8.86 (225) 8.07 (205) -0.79 (-20) -8.9%
Circum. inches (mm) 82.94 (2106.75) 82.62 (2098.58) -0.32 (-8.17) -0.4%
Sidewall Height inches (mm) 6.2 (157.5) 5.65 (143.5) -0.55 (-14) -8.9%
Revolutions per mile (km) 763.9 (474.66) 766.87 (476.51) 2.97 (1.85) 0.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.92 mph (32.06 km/h)
25 mph (40.23 km/h)24.9 mph (40.08 km/h)
30 mph (48.28 km/h)29.88 mph (48.09 km/h)
35 mph (56.33 km/h)34.86 mph (56.11 km/h)
40 mph (64.37 km/h)39.84 mph (64.12 km/h)
45 mph (72.42 km/h)44.83 mph (72.14 km/h)
50 mph (80.47 km/h)49.81 mph (80.16 km/h)
55 mph (88.51 km/h)54.79 mph (88.17 km/h)
60 mph (96.56 km/h)59.77 mph (96.19 km/h)
65 mph (104.61 km/h)64.75 mph (104.2 km/h)
70 mph (112.65 km/h)69.73 mph (112.22 km/h)
75 mph (120.7 km/h)74.71 mph (120.23 km/h)
80 mph (128.75 km/h)79.69 mph (128.25 km/h)
85 mph (136.79 km/h)84.67 mph (136.26 km/h)
90 mph (144.84 km/h)89.65 mph (144.28 km/h)
95 mph (152.89 km/h)94.63 mph (152.3 km/h)
100 mph (160.93 km/h)99.61 mph (160.31 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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