Tire Size Calculator

Tire Size Finder (optional):

Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
28/9r15 vs 225/75r15 Tire Comparison Side By Side
  28/9-15 225/75-15 Difference
Diameter inches (mm) 27.98 (710.76) 28.29 (718.5) 0.3 (7.74) 1.1%
Width inches (mm) 9.02 (229) 8.86 (225) -0.16 (-4) -1.7%
Circum. inches (mm) 87.91 (2232.92) 88.87 (2257.23) 0.96 (24.32) 1.1%
Sidewall Height inches (mm) 6.49 (164.88) 6.64 (168.75) 0.15 (3.87) 2.3%
Revolutions per mile (km) 720.74 (447.84) 712.97 (443.02) -7.76 (-4.82) -1.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.22 mph (32.54 km/h)
25 mph (40.23 km/h)25.27 mph (40.67 km/h)
30 mph (48.28 km/h)30.33 mph (48.81 km/h)
35 mph (56.33 km/h)35.38 mph (56.94 km/h)
40 mph (64.37 km/h)40.44 mph (65.07 km/h)
45 mph (72.42 km/h)45.49 mph (73.21 km/h)
50 mph (80.47 km/h)50.54 mph (81.34 km/h)
55 mph (88.51 km/h)55.6 mph (89.48 km/h)
60 mph (96.56 km/h)60.65 mph (97.61 km/h)
65 mph (104.61 km/h)65.71 mph (105.75 km/h)
70 mph (112.65 km/h)70.76 mph (113.88 km/h)
75 mph (120.7 km/h)75.82 mph (122.02 km/h)
80 mph (128.75 km/h)80.87 mph (130.15 km/h)
85 mph (136.79 km/h)85.93 mph (138.28 km/h)
90 mph (144.84 km/h)90.98 mph (146.42 km/h)
95 mph (152.89 km/h)96.03 mph (154.55 km/h)
100 mph (160.93 km/h)101.09 mph (162.69 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
18142108227023702478255626402741288030193173329735213768396140844154440947645536
Better Fuel Economy Factory Ratios Increased Power

Most Popular 28/9-R15 Comparisons

To Top