Tire Size Calculator

Tire Size Finder (optional):

Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
245/50r18 vs 235/55r18 Tire Comparison Side By Side
  245/50-18 235/55-18 Difference
Diameter inches (mm) 27.65 (702.2) 28.18 (715.7) 0.53 (13.5) 1.9%
Width inches (mm) 9.65 (245) 9.25 (235) -0.39 (-10) -4.1%
Circum. inches (mm) 86.85 (2206.03) 88.52 (2248.44) 1.67 (42.41) 1.9%
Sidewall Height inches (mm) 4.82 (122.5) 5.09 (129.25) 0.27 (6.75) 5.5%
Revolutions per mile (km) 729.52 (453.3) 715.76 (444.75) -13.76 (-8.55) -1.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.38 mph (32.81 km/h)
25 mph (40.23 km/h)25.48 mph (41.01 km/h)
30 mph (48.28 km/h)30.58 mph (49.21 km/h)
35 mph (56.33 km/h)35.67 mph (57.41 km/h)
40 mph (64.37 km/h)40.77 mph (65.61 km/h)
45 mph (72.42 km/h)45.87 mph (73.81 km/h)
50 mph (80.47 km/h)50.96 mph (82.01 km/h)
55 mph (88.51 km/h)56.06 mph (90.22 km/h)
60 mph (96.56 km/h)61.15 mph (98.42 km/h)
65 mph (104.61 km/h)66.25 mph (106.62 km/h)
70 mph (112.65 km/h)71.35 mph (114.82 km/h)
75 mph (120.7 km/h)76.44 mph (123.02 km/h)
80 mph (128.75 km/h)81.54 mph (131.22 km/h)
85 mph (136.79 km/h)86.63 mph (139.42 km/h)
90 mph (144.84 km/h)91.73 mph (147.63 km/h)
95 mph (152.89 km/h)96.83 mph (155.83 km/h)
100 mph (160.93 km/h)101.92 mph (164.03 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
18212116227923802488256626512752289130313186331035343782397641004170442647825557
Better Fuel Economy Factory Ratios Increased Power

Most Popular 245/50-R18 Comparisons

To Top