Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
225/60r18 vs 215/70r16 Tire Comparison Side By Side
  225/60-18 215/70-16 Difference
Diameter inches (mm) 28.63 (727.2) 27.85 (707.4) -0.78 (-19.8) -2.7%
Width inches (mm) 8.86 (225) 8.46 (215) -0.39 (-10) -4.4%
Circum. inches (mm) 89.94 (2284.57) 87.49 (2222.36) -2.45 (-62.2) -2.7%
Sidewall Height inches (mm) 5.31 (135) 5.93 (150.5) 0.61 (15.5) 11.5%
Revolutions per mile (km) 704.44 (437.72) 724.16 (449.97) 19.72 (12.25) 2.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.46 mph (31.31 km/h)
25 mph (40.23 km/h)24.32 mph (39.14 km/h)
30 mph (48.28 km/h)29.18 mph (46.97 km/h)
35 mph (56.33 km/h)34.05 mph (54.79 km/h)
40 mph (64.37 km/h)38.91 mph (62.62 km/h)
45 mph (72.42 km/h)43.77 mph (70.45 km/h)
50 mph (80.47 km/h)48.64 mph (78.28 km/h)
55 mph (88.51 km/h)53.5 mph (86.1 km/h)
60 mph (96.56 km/h)58.37 mph (93.93 km/h)
65 mph (104.61 km/h)63.23 mph (101.76 km/h)
70 mph (112.65 km/h)68.09 mph (109.59 km/h)
75 mph (120.7 km/h)72.96 mph (117.41 km/h)
80 mph (128.75 km/h)77.82 mph (125.24 km/h)
85 mph (136.79 km/h)82.69 mph (133.07 km/h)
90 mph (144.84 km/h)87.55 mph (140.9 km/h)
95 mph (152.89 km/h)92.41 mph (148.73 km/h)
100 mph (160.93 km/h)97.28 mph (156.55 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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