Tire Size Calculator

Tire Size Finder (optional):

Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
185/60r15 vs 205/55r15 Tire Comparison Side By Side
  185/60-15 205/55-15 Difference
Diameter inches (mm) 23.74 (603) 23.88 (606.5) 0.14 (3.5) 0.6%
Width inches (mm) 7.28 (185) 8.07 (205) 0.79 (20) 10.8%
Circum. inches (mm) 74.58 (1894.38) 75.01 (1905.38) 0.43 (11) 0.6%
Sidewall Height inches (mm) 4.37 (111) 4.44 (112.75) 0.07 (1.75) 1.6%
Revolutions per mile (km) 849.54 (527.88) 844.63 (524.83) -4.9 (-3.05) -0.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.12 mph (32.37 km/h)
25 mph (40.23 km/h)25.15 mph (40.47 km/h)
30 mph (48.28 km/h)30.17 mph (48.56 km/h)
35 mph (56.33 km/h)35.2 mph (56.65 km/h)
40 mph (64.37 km/h)40.23 mph (64.75 km/h)
45 mph (72.42 km/h)45.26 mph (72.84 km/h)
50 mph (80.47 km/h)50.29 mph (80.93 km/h)
55 mph (88.51 km/h)55.32 mph (89.03 km/h)
60 mph (96.56 km/h)60.35 mph (97.12 km/h)
65 mph (104.61 km/h)65.38 mph (105.21 km/h)
70 mph (112.65 km/h)70.41 mph (113.31 km/h)
75 mph (120.7 km/h)75.44 mph (121.4 km/h)
80 mph (128.75 km/h)80.46 mph (129.5 km/h)
85 mph (136.79 km/h)85.49 mph (137.59 km/h)
90 mph (144.84 km/h)90.52 mph (145.68 km/h)
95 mph (152.89 km/h)95.55 mph (153.78 km/h)
100 mph (160.93 km/h)100.58 mph (161.87 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
21492497268928082936302731283247341235763759390641714463469248394921522356436558
Better Fuel Economy Factory Ratios Increased Power

Most Popular 185/60-R15 Comparisons

To Top