Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
110/100r12 vs 120/80r12 Tire Comparison Side By Side
  110/100-12 120/80-12 Difference
Diameter inches (mm) 20.66 (524.8) 19.56 (496.8) -1.1 (-28) -5.3%
Width inches (mm) 4.33 (110) 4.72 (120) 0.39 (10) 9.1%
Circum. inches (mm) 64.91 (1648.71) 61.45 (1560.74) -3.46 (-87.96) -5.3%
Sidewall Height inches (mm) 4.33 (110) 3.78 (96) -0.55 (-14) -12.7%
Revolutions per mile (km) 976.12 (606.53) 1031.14 (640.72) 55.02 (34.18) 5.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.93 mph (30.47 km/h)
25 mph (40.23 km/h)23.67 mph (38.09 km/h)
30 mph (48.28 km/h)28.4 mph (45.7 km/h)
35 mph (56.33 km/h)33.13 mph (53.32 km/h)
40 mph (64.37 km/h)37.87 mph (60.94 km/h)
45 mph (72.42 km/h)42.6 mph (68.56 km/h)
50 mph (80.47 km/h)47.33 mph (76.17 km/h)
55 mph (88.51 km/h)52.07 mph (83.79 km/h)
60 mph (96.56 km/h)56.8 mph (91.41 km/h)
65 mph (104.61 km/h)61.53 mph (99.03 km/h)
70 mph (112.65 km/h)66.27 mph (106.64 km/h)
75 mph (120.7 km/h)71 mph (114.26 km/h)
80 mph (128.75 km/h)75.73 mph (121.88 km/h)
85 mph (136.79 km/h)80.46 mph (129.5 km/h)
90 mph (144.84 km/h)85.2 mph (137.11 km/h)
95 mph (152.89 km/h)89.93 mph (144.73 km/h)
100 mph (160.93 km/h)94.66 mph (152.35 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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