Tire Size Calculator

Tire Size Finder (optional):

Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
205/70r15 vs 205/55r15 Tire Comparison Side By Side
  205/70-15 205/55-15 Difference
Diameter inches (mm) 26.3 (668) 23.88 (606.5) -2.42 (-61.5) -9.2%
Width inches (mm) 8.07 (205) 8.07 (205) 0 (0) 0%
Circum. inches (mm) 82.62 (2098.58) 75.01 (1905.38) -7.61 (-193.21) -9.2%
Sidewall Height inches (mm) 5.65 (143.5) 4.44 (112.75) -1.21 (-30.75) -21.4%
Revolutions per mile (km) 766.87 (476.51) 844.63 (524.83) 77.76 (48.32) 10.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.16 mph (29.22 km/h)
25 mph (40.23 km/h)22.7 mph (36.53 km/h)
30 mph (48.28 km/h)27.24 mph (43.84 km/h)
35 mph (56.33 km/h)31.78 mph (51.14 km/h)
40 mph (64.37 km/h)36.32 mph (58.45 km/h)
45 mph (72.42 km/h)40.86 mph (65.75 km/h)
50 mph (80.47 km/h)45.4 mph (73.06 km/h)
55 mph (88.51 km/h)49.94 mph (80.36 km/h)
60 mph (96.56 km/h)54.48 mph (87.67 km/h)
65 mph (104.61 km/h)59.02 mph (94.98 km/h)
70 mph (112.65 km/h)63.56 mph (102.28 km/h)
75 mph (120.7 km/h)68.1 mph (109.59 km/h)
80 mph (128.75 km/h)72.63 mph (116.89 km/h)
85 mph (136.79 km/h)77.17 mph (124.2 km/h)
90 mph (144.84 km/h)81.71 mph (131.51 km/h)
95 mph (152.89 km/h)86.25 mph (138.81 km/h)
100 mph (160.93 km/h)90.79 mph (146.12 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 205/70-R15 Comparisons

To Top