Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
120/80r13 vs 110/80r13 Tire Comparison Side By Side
  120/80-13 110/80-13 Difference
Diameter inches (mm) 20.56 (522.2) 19.93 (506.2) -0.63 (-16) -3.1%
Width inches (mm) 4.72 (120) 4.33 (110) -0.39 (-10) -8.3%
Circum. inches (mm) 64.59 (1640.54) 62.61 (1590.27) -1.98 (-50.27) -3.1%
Sidewall Height inches (mm) 3.78 (96) 3.46 (88) -0.31 (-8) -8.3%
Revolutions per mile (km) 980.98 (609.55) 1011.99 (628.82) 31.01 (19.27) 3.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.39 mph (31.2 km/h)
25 mph (40.23 km/h)24.23 mph (39 km/h)
30 mph (48.28 km/h)29.08 mph (46.8 km/h)
35 mph (56.33 km/h)33.93 mph (54.6 km/h)
40 mph (64.37 km/h)38.77 mph (62.4 km/h)
45 mph (72.42 km/h)43.62 mph (70.2 km/h)
50 mph (80.47 km/h)48.47 mph (78 km/h)
55 mph (88.51 km/h)53.31 mph (85.8 km/h)
60 mph (96.56 km/h)58.16 mph (93.6 km/h)
65 mph (104.61 km/h)63.01 mph (101.4 km/h)
70 mph (112.65 km/h)67.86 mph (109.2 km/h)
75 mph (120.7 km/h)72.7 mph (117 km/h)
80 mph (128.75 km/h)77.55 mph (124.8 km/h)
85 mph (136.79 km/h)82.4 mph (132.6 km/h)
90 mph (144.84 km/h)87.24 mph (140.4 km/h)
95 mph (152.89 km/h)92.09 mph (148.2 km/h)
100 mph (160.93 km/h)96.94 mph (156 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
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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