Tire Size Calculator

Tire Size Finder (optional):

Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
235/50r18 vs 225/60r17 Tire Comparison Side By Side
  235/50-18 225/60-17 Difference
Diameter inches (mm) 27.25 (692.2) 27.63 (701.8) 0.38 (9.6) 1.4%
Width inches (mm) 9.25 (235) 8.86 (225) -0.39 (-10) -4.3%
Circum. inches (mm) 85.61 (2174.61) 86.8 (2204.77) 1.19 (30.16) 1.4%
Sidewall Height inches (mm) 4.63 (117.5) 5.31 (135) 0.69 (17.5) 14.9%
Revolutions per mile (km) 740.06 (459.85) 729.94 (453.56) -10.12 (-6.29) -1.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.28 mph (32.63 km/h)
25 mph (40.23 km/h)25.35 mph (40.79 km/h)
30 mph (48.28 km/h)30.42 mph (48.95 km/h)
35 mph (56.33 km/h)35.49 mph (57.11 km/h)
40 mph (64.37 km/h)40.55 mph (65.27 km/h)
45 mph (72.42 km/h)45.62 mph (73.43 km/h)
50 mph (80.47 km/h)50.69 mph (81.58 km/h)
55 mph (88.51 km/h)55.76 mph (89.74 km/h)
60 mph (96.56 km/h)60.83 mph (97.9 km/h)
65 mph (104.61 km/h)65.9 mph (106.06 km/h)
70 mph (112.65 km/h)70.97 mph (114.22 km/h)
75 mph (120.7 km/h)76.04 mph (122.38 km/h)
80 mph (128.75 km/h)81.11 mph (130.53 km/h)
85 mph (136.79 km/h)86.18 mph (138.69 km/h)
90 mph (144.84 km/h)91.25 mph (146.85 km/h)
95 mph (152.89 km/h)96.32 mph (155.01 km/h)
100 mph (160.93 km/h)101.39 mph (163.17 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
18582158232424272537261627032806294830913249337536043857405541814253451348775668
Better Fuel Economy Factory Ratios Increased Power

Most Popular 235/50-R18 Comparisons

To Top