Tire Size Calculator

Tire Size Finder (optional):

Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
245/60r18 vs 255/50r20 Tire Comparison Side By Side
  245/60-18 255/50-20 Difference
Diameter inches (mm) 29.57 (751.2) 30.04 (763) 0.46 (11.8) 1.6%
Width inches (mm) 9.65 (245) 10.04 (255) 0.39 (10) 4.1%
Circum. inches (mm) 92.91 (2359.96) 94.37 (2397.04) 1.46 (37.07) 1.6%
Sidewall Height inches (mm) 5.79 (147) 5.02 (127.5) -0.77 (-19.5) -13.3%
Revolutions per mile (km) 681.94 (423.73) 671.39 (417.18) -10.55 (-6.55) -1.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.31 mph (32.69 km/h)
25 mph (40.23 km/h)25.39 mph (40.87 km/h)
30 mph (48.28 km/h)30.47 mph (49.04 km/h)
35 mph (56.33 km/h)35.55 mph (57.21 km/h)
40 mph (64.37 km/h)40.63 mph (65.39 km/h)
45 mph (72.42 km/h)45.71 mph (73.56 km/h)
50 mph (80.47 km/h)50.79 mph (81.73 km/h)
55 mph (88.51 km/h)55.86 mph (89.9 km/h)
60 mph (96.56 km/h)60.94 mph (98.08 km/h)
65 mph (104.61 km/h)66.02 mph (106.25 km/h)
70 mph (112.65 km/h)71.1 mph (114.42 km/h)
75 mph (120.7 km/h)76.18 mph (122.6 km/h)
80 mph (128.75 km/h)81.26 mph (130.77 km/h)
85 mph (136.79 km/h)86.34 mph (138.94 km/h)
90 mph (144.84 km/h)91.41 mph (147.12 km/h)
95 mph (152.89 km/h)96.49 mph (155.29 km/h)
100 mph (160.93 km/h)101.57 mph (163.46 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
17091985213822322334240724862581271228432988310433153548373038463912415144865213
Better Fuel Economy Factory Ratios Increased Power

Most Popular 245/60-R18 Comparisons

To Top