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 275/60r15 Tire Comparison Side By Side
  28/9-15 275/60-15 Difference
Diameter inches (mm) 27.98 (710.76) 27.99 (711) 0.01 (0.24) 0%
Width inches (mm) 9.02 (229) 10.83 (275) 1.81 (46) 20.1%
Circum. inches (mm) 87.91 (2232.92) 87.94 (2233.67) 0.03 (0.75) 0%
Sidewall Height inches (mm) 6.49 (164.88) 6.5 (165) 0 (0.12) 0.1%
Revolutions per mile (km) 720.74 (447.84) 720.49 (447.69) -0.24 (-0.15) -0%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.01 mph (32.2 km/h)
25 mph (40.23 km/h)25.01 mph (40.25 km/h)
30 mph (48.28 km/h)30.01 mph (48.3 km/h)
35 mph (56.33 km/h)35.01 mph (56.35 km/h)
40 mph (64.37 km/h)40.01 mph (64.4 km/h)
45 mph (72.42 km/h)45.02 mph (72.45 km/h)
50 mph (80.47 km/h)50.02 mph (80.49 km/h)
55 mph (88.51 km/h)55.02 mph (88.54 km/h)
60 mph (96.56 km/h)60.02 mph (96.59 km/h)
65 mph (104.61 km/h)65.02 mph (104.64 km/h)
70 mph (112.65 km/h)70.02 mph (112.69 km/h)
75 mph (120.7 km/h)75.03 mph (120.74 km/h)
80 mph (128.75 km/h)80.03 mph (128.79 km/h)
85 mph (136.79 km/h)85.03 mph (136.84 km/h)
90 mph (144.84 km/h)90.03 mph (144.89 km/h)
95 mph (152.89 km/h)95.03 mph (152.94 km/h)
100 mph (160.93 km/h)100.03 mph (160.99 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
18342130229423952505258326682770291030513207333235583807400341274198445548145594
Better Fuel Economy Factory Ratios Increased Power

Most Popular 28/9-R15 Comparisons

To Top