Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
225/45r13 vs 205/35r15 Tire Comparison Side By Side
  225/45-13 205/35-15 Difference
Diameter inches (mm) 20.97 (532.7) 20.65 (524.5) -0.32 (-8.2) -1.5%
Width inches (mm) 8.86 (225) 8.07 (205) -0.79 (-20) -8.9%
Circum. inches (mm) 65.89 (1673.53) 64.87 (1647.77) -1.01 (-25.76) -1.5%
Sidewall Height inches (mm) 3.99 (101.25) 2.82 (71.75) -1.16 (-29.5) -29.1%
Revolutions per mile (km) 961.65 (597.54) 976.68 (606.88) 15.03 (9.34) 1.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.69 mph (31.69 km/h)
25 mph (40.23 km/h)24.62 mph (39.61 km/h)
30 mph (48.28 km/h)29.54 mph (47.54 km/h)
35 mph (56.33 km/h)34.46 mph (55.46 km/h)
40 mph (64.37 km/h)39.38 mph (63.38 km/h)
45 mph (72.42 km/h)44.31 mph (71.31 km/h)
50 mph (80.47 km/h)49.23 mph (79.23 km/h)
55 mph (88.51 km/h)54.15 mph (87.15 km/h)
60 mph (96.56 km/h)59.08 mph (95.07 km/h)
65 mph (104.61 km/h)64 mph (103 km/h)
70 mph (112.65 km/h)68.92 mph (110.92 km/h)
75 mph (120.7 km/h)73.85 mph (118.84 km/h)
80 mph (128.75 km/h)78.77 mph (126.77 km/h)
85 mph (136.79 km/h)83.69 mph (134.69 km/h)
90 mph (144.84 km/h)88.61 mph (142.61 km/h)
95 mph (152.89 km/h)93.54 mph (150.53 km/h)
100 mph (160.93 km/h)98.46 mph (158.46 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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