Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
125/80r16 vs 115/90r16 Tire Comparison Side By Side
  125/80-16 115/90-16 Difference
Diameter inches (mm) 23.87 (606.4) 24.15 (613.4) 0.28 (7) 1.2%
Width inches (mm) 4.92 (125) 4.53 (115) -0.39 (-10) -8%
Circum. inches (mm) 75 (1905.06) 75.87 (1927.05) 0.87 (21.99) 1.2%
Sidewall Height inches (mm) 3.94 (100) 4.07 (103.5) 0.14 (3.5) 3.5%
Revolutions per mile (km) 844.77 (524.92) 835.13 (518.93) -9.64 (-5.99) -1.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.23 mph (32.56 km/h)
25 mph (40.23 km/h)25.29 mph (40.7 km/h)
30 mph (48.28 km/h)30.35 mph (48.84 km/h)
35 mph (56.33 km/h)35.4 mph (56.98 km/h)
40 mph (64.37 km/h)40.46 mph (65.12 km/h)
45 mph (72.42 km/h)45.52 mph (73.26 km/h)
50 mph (80.47 km/h)50.58 mph (81.4 km/h)
55 mph (88.51 km/h)55.63 mph (89.54 km/h)
60 mph (96.56 km/h)60.69 mph (97.68 km/h)
65 mph (104.61 km/h)65.75 mph (105.82 km/h)
70 mph (112.65 km/h)70.81 mph (113.95 km/h)
75 mph (120.7 km/h)75.87 mph (122.09 km/h)
80 mph (128.75 km/h)80.92 mph (130.23 km/h)
85 mph (136.79 km/h)85.98 mph (138.37 km/h)
90 mph (144.84 km/h)91.04 mph (146.51 km/h)
95 mph (152.89 km/h)96.1 mph (154.65 km/h)
100 mph (160.93 km/h)101.15 mph (162.79 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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