Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
120/80r14 vs 110/80r14 Tire Comparison Side By Side
  120/80-14 110/80-14 Difference
Diameter inches (mm) 21.56 (547.6) 20.93 (531.6) -0.63 (-16) -2.9%
Width inches (mm) 4.72 (120) 4.33 (110) -0.39 (-10) -8.3%
Circum. inches (mm) 67.73 (1720.34) 65.75 (1670.07) -1.98 (-50.27) -2.9%
Sidewall Height inches (mm) 3.78 (96) 3.46 (88) -0.31 (-8) -8.3%
Revolutions per mile (km) 935.48 (581.28) 963.64 (598.78) 28.16 (17.5) 3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.42 mph (31.25 km/h)
25 mph (40.23 km/h)24.27 mph (39.06 km/h)
30 mph (48.28 km/h)29.12 mph (46.87 km/h)
35 mph (56.33 km/h)33.98 mph (54.68 km/h)
40 mph (64.37 km/h)38.83 mph (62.49 km/h)
45 mph (72.42 km/h)43.69 mph (70.3 km/h)
50 mph (80.47 km/h)48.54 mph (78.12 km/h)
55 mph (88.51 km/h)53.39 mph (85.93 km/h)
60 mph (96.56 km/h)58.25 mph (93.74 km/h)
65 mph (104.61 km/h)63.1 mph (101.55 km/h)
70 mph (112.65 km/h)67.95 mph (109.36 km/h)
75 mph (120.7 km/h)72.81 mph (117.17 km/h)
80 mph (128.75 km/h)77.66 mph (124.99 km/h)
85 mph (136.79 km/h)82.52 mph (132.8 km/h)
90 mph (144.84 km/h)87.37 mph (140.61 km/h)
95 mph (152.89 km/h)92.22 mph (148.42 km/h)
100 mph (160.93 km/h)97.08 mph (156.23 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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