Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
120/80r12 vs 110/80r12 Tire Comparison Side By Side
  120/80-12 110/80-12 Difference
Diameter inches (mm) 19.56 (496.8) 18.93 (480.8) -0.63 (-16) -3.2%
Width inches (mm) 4.72 (120) 4.33 (110) -0.39 (-10) -8.3%
Circum. inches (mm) 61.45 (1560.74) 59.47 (1510.48) -1.98 (-50.27) -3.2%
Sidewall Height inches (mm) 3.78 (96) 3.46 (88) -0.31 (-8) -8.3%
Revolutions per mile (km) 1031.14 (640.72) 1065.45 (662.04) 34.31 (21.32) 3.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.36 mph (31.15 km/h)
25 mph (40.23 km/h)24.19 mph (38.94 km/h)
30 mph (48.28 km/h)29.03 mph (46.73 km/h)
35 mph (56.33 km/h)33.87 mph (54.51 km/h)
40 mph (64.37 km/h)38.71 mph (62.3 km/h)
45 mph (72.42 km/h)43.55 mph (70.09 km/h)
50 mph (80.47 km/h)48.39 mph (77.88 km/h)
55 mph (88.51 km/h)53.23 mph (85.66 km/h)
60 mph (96.56 km/h)58.07 mph (93.45 km/h)
65 mph (104.61 km/h)62.91 mph (101.24 km/h)
70 mph (112.65 km/h)67.75 mph (109.03 km/h)
75 mph (120.7 km/h)72.58 mph (116.81 km/h)
80 mph (128.75 km/h)77.42 mph (124.6 km/h)
85 mph (136.79 km/h)82.26 mph (132.39 km/h)
90 mph (144.84 km/h)87.1 mph (140.18 km/h)
95 mph (152.89 km/h)91.94 mph (147.96 km/h)
100 mph (160.93 km/h)96.78 mph (155.75 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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