Mike "Wuzzy121". Rest in peace, brother

Tire Size Calculator

Tire Size Finder (optional):

Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
225/60r18 vs 235/60r18 Tire Comparison Side By Side
  225/60-18 235/60-18 Difference
Diameter inches (mm) 28.63 (727.2) 29.1 (739.2) 0.47 (12) 1.7%
Width inches (mm) 8.86 (225) 9.25 (235) 0.39 (10) 4.4%
Circum. inches (mm) 89.94 (2284.57) 91.43 (2322.27) 1.48 (37.7) 1.7%
Sidewall Height inches (mm) 5.31 (135) 5.55 (141) 0.24 (6) 4.4%
Revolutions per mile (km) 704.44 (437.72) 693.01 (430.61) -11.44 (-7.11) -1.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.33 mph (32.72 km/h)
25 mph (40.23 km/h)25.41 mph (40.9 km/h)
30 mph (48.28 km/h)30.5 mph (49.08 km/h)
35 mph (56.33 km/h)35.58 mph (57.26 km/h)
40 mph (64.37 km/h)40.66 mph (65.44 km/h)
45 mph (72.42 km/h)45.74 mph (73.62 km/h)
50 mph (80.47 km/h)50.83 mph (81.8 km/h)
55 mph (88.51 km/h)55.91 mph (89.97 km/h)
60 mph (96.56 km/h)60.99 mph (98.15 km/h)
65 mph (104.61 km/h)66.07 mph (106.33 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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