Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
28/9r15 vs 265/90r15 Tire Comparison Side By Side
  28/9-15 265/90-15 Difference
Diameter inches (mm) 27.98 (710.76) 33.78 (858) 5.8 (147.24) 20.7%
Width inches (mm) 9.02 (229) 10.43 (265) 1.42 (36) 15.7%
Circum. inches (mm) 87.91 (2232.92) 106.12 (2695.49) 18.21 (462.57) 20.7%
Sidewall Height inches (mm) 6.49 (164.88) 9.39 (238.5) 2.9 (73.62) 44.7%
Revolutions per mile (km) 720.74 (447.84) 597.05 (370.99) -123.68 (-76.85) -17.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)24.14 mph (38.85 km/h)
25 mph (40.23 km/h)30.18 mph (48.57 km/h)
30 mph (48.28 km/h)36.21 mph (58.28 km/h)
35 mph (56.33 km/h)42.25 mph (68 km/h)
40 mph (64.37 km/h)48.29 mph (77.71 km/h)
45 mph (72.42 km/h)54.32 mph (87.42 km/h)
50 mph (80.47 km/h)60.36 mph (97.14 km/h)
55 mph (88.51 km/h)66.39 mph (106.85 km/h)
60 mph (96.56 km/h)72.43 mph (116.56 km/h)
65 mph (104.61 km/h)78.47 mph (126.28 km/h)
70 mph (112.65 km/h)84.5 mph (135.99 km/h)
75 mph (120.7 km/h)90.54 mph (145.71 km/h)
80 mph (128.75 km/h)96.57 mph (155.42 km/h)
85 mph (136.79 km/h)102.61 mph (165.13 km/h)
90 mph (144.84 km/h)108.64 mph (174.85 km/h)
95 mph (152.89 km/h)114.68 mph (184.56 km/h)
100 mph (160.93 km/h)120.72 mph (194.27 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
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