Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
90/80r12 vs 110/90r12 Tire Comparison Side By Side
  90/80-12 110/90-12 Difference
Diameter inches (mm) 17.67 (448.8) 19.8 (502.8) 2.13 (54) 12%
Width inches (mm) 3.54 (90) 4.33 (110) 0.79 (20) 22.2%
Circum. inches (mm) 55.51 (1409.95) 62.19 (1579.59) 6.68 (169.65) 12%
Sidewall Height inches (mm) 2.83 (72) 3.9 (99) 1.06 (27) 37.5%
Revolutions per mile (km) 1141.42 (709.25) 1018.83 (633.07) -122.59 (-76.17) -10.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)22.41 mph (36.06 km/h)
25 mph (40.23 km/h)28.01 mph (45.07 km/h)
30 mph (48.28 km/h)33.61 mph (54.09 km/h)
35 mph (56.33 km/h)39.21 mph (63.1 km/h)
40 mph (64.37 km/h)44.81 mph (72.12 km/h)
45 mph (72.42 km/h)50.41 mph (81.13 km/h)
50 mph (80.47 km/h)56.02 mph (90.15 km/h)
55 mph (88.51 km/h)61.62 mph (99.16 km/h)
60 mph (96.56 km/h)67.22 mph (108.18 km/h)
65 mph (104.61 km/h)72.82 mph (117.19 km/h)
70 mph (112.65 km/h)78.42 mph (126.21 km/h)
75 mph (120.7 km/h)84.02 mph (135.22 km/h)
80 mph (128.75 km/h)89.63 mph (144.24 km/h)
85 mph (136.79 km/h)95.23 mph (153.25 km/h)
90 mph (144.84 km/h)100.83 mph (162.27 km/h)
95 mph (152.89 km/h)106.43 mph (171.28 km/h)
100 mph (160.93 km/h)112.03 mph (180.3 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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