Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
120/60r12 vs 110/80r12 Tire Comparison Side By Side
  120/60-12 110/80-12 Difference
Diameter inches (mm) 17.67 (448.8) 18.93 (480.8) 1.26 (32) 7.1%
Width inches (mm) 4.72 (120) 4.33 (110) -0.39 (-10) -8.3%
Circum. inches (mm) 55.51 (1409.95) 59.47 (1510.48) 3.96 (100.53) 7.1%
Sidewall Height inches (mm) 2.83 (72) 3.46 (88) 0.63 (16) 22.2%
Revolutions per mile (km) 1141.42 (709.25) 1065.45 (662.04) -75.97 (-47.2) -6.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.43 mph (34.48 km/h)
25 mph (40.23 km/h)26.78 mph (43.1 km/h)
30 mph (48.28 km/h)32.14 mph (51.72 km/h)
35 mph (56.33 km/h)37.5 mph (60.34 km/h)
40 mph (64.37 km/h)42.85 mph (68.96 km/h)
45 mph (72.42 km/h)48.21 mph (77.58 km/h)
50 mph (80.47 km/h)53.57 mph (86.2 km/h)
55 mph (88.51 km/h)58.92 mph (94.83 km/h)
60 mph (96.56 km/h)64.28 mph (103.45 km/h)
65 mph (104.61 km/h)69.63 mph (112.07 km/h)
70 mph (112.65 km/h)74.99 mph (120.69 km/h)
75 mph (120.7 km/h)80.35 mph (129.31 km/h)
80 mph (128.75 km/h)85.7 mph (137.93 km/h)
85 mph (136.79 km/h)91.06 mph (146.55 km/h)
90 mph (144.84 km/h)96.42 mph (155.17 km/h)
95 mph (152.89 km/h)101.77 mph (163.79 km/h)
100 mph (160.93 km/h)107.13 mph (172.41 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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