Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
225/60r16 vs 225/40r18 Tire Comparison Side By Side
  225/60-16 225/40-18 Difference
Diameter inches (mm) 26.63 (676.4) 25.09 (637.2) -1.54 (-39.2) -5.8%
Width inches (mm) 8.86 (225) 8.86 (225) 0 (0) 0%
Circum. inches (mm) 83.66 (2124.97) 78.81 (2001.82) -4.85 (-123.15) -5.8%
Sidewall Height inches (mm) 5.31 (135) 3.54 (90) -1.77 (-45) -33.3%
Revolutions per mile (km) 757.35 (470.59) 803.94 (499.54) 46.59 (28.95) 6.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.84 mph (30.32 km/h)
25 mph (40.23 km/h)23.55 mph (37.9 km/h)
30 mph (48.28 km/h)28.26 mph (45.48 km/h)
35 mph (56.33 km/h)32.97 mph (53.06 km/h)
40 mph (64.37 km/h)37.68 mph (60.64 km/h)
45 mph (72.42 km/h)42.39 mph (68.22 km/h)
50 mph (80.47 km/h)47.1 mph (75.8 km/h)
55 mph (88.51 km/h)51.81 mph (83.38 km/h)
60 mph (96.56 km/h)56.52 mph (90.96 km/h)
65 mph (104.61 km/h)61.23 mph (98.55 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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