Tire Size Calculator

Tire Size Finder (optional):

Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
125/90r15 vs 205/45r17 Tire Comparison Side By Side
  125/90-15 205/45-17 Difference
Diameter inches (mm) 23.86 (606) 24.26 (616.3) 0.41 (10.3) 1.7%
Width inches (mm) 4.92 (125) 8.07 (205) 3.15 (80) 64%
Circum. inches (mm) 74.95 (1903.81) 76.23 (1936.16) 1.27 (32.36) 1.7%
Sidewall Height inches (mm) 4.43 (112.5) 3.63 (92.25) -0.8 (-20.25) -18%
Revolutions per mile (km) 845.33 (525.26) 831.2 (516.48) -14.13 (-8.78) -1.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.34 mph (32.73 km/h)
25 mph (40.23 km/h)25.42 mph (40.92 km/h)
30 mph (48.28 km/h)30.51 mph (49.1 km/h)
35 mph (56.33 km/h)35.59 mph (57.28 km/h)
40 mph (64.37 km/h)40.68 mph (65.47 km/h)
45 mph (72.42 km/h)45.76 mph (73.65 km/h)
50 mph (80.47 km/h)50.85 mph (81.84 km/h)
55 mph (88.51 km/h)55.93 mph (90.02 km/h)
60 mph (96.56 km/h)61.02 mph (98.2 km/h)
65 mph (104.61 km/h)66.1 mph (106.39 km/h)
70 mph (112.65 km/h)71.19 mph (114.57 km/h)
75 mph (120.7 km/h)76.27 mph (122.75 km/h)
80 mph (128.75 km/h)81.36 mph (130.94 km/h)
85 mph (136.79 km/h)86.44 mph (139.12 km/h)
90 mph (144.84 km/h)91.53 mph (147.3 km/h)
95 mph (152.89 km/h)96.61 mph (155.49 km/h)
100 mph (160.93 km/h)101.7 mph (163.67 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
21152457264627632889297930783195335735193699384341044393461847624843514055546454
Better Fuel Economy Factory Ratios Increased Power

Most Popular 125/90-R15 Comparisons

To Top