Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
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90/90r12 vs 110/90r10 Tire Comparison Side By Side
  90/90-12 110/90-10 Difference
Diameter inches (mm) 18.38 (466.8) 17.8 (452) -0.58 (-14.8) -3.2%
Width inches (mm) 3.54 (90) 4.33 (110) 0.79 (20) 22.2%
Circum. inches (mm) 57.74 (1466.5) 55.91 (1420) -1.83 (-46.5) -3.2%
Sidewall Height inches (mm) 3.19 (81) 3.9 (99) 0.71 (18) 22.2%
Revolutions per mile (km) 1097.41 (681.9) 1133.34 (704.22) 35.93 (22.33) 3.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.37 mph (31.17 km/h)
25 mph (40.23 km/h)24.21 mph (38.96 km/h)
30 mph (48.28 km/h)29.05 mph (46.75 km/h)
35 mph (56.33 km/h)33.89 mph (54.54 km/h)
40 mph (64.37 km/h)38.73 mph (62.33 km/h)
45 mph (72.42 km/h)43.57 mph (70.12 km/h)
50 mph (80.47 km/h)48.41 mph (77.92 km/h)
55 mph (88.51 km/h)53.26 mph (85.71 km/h)
60 mph (96.56 km/h)58.1 mph (93.5 km/h)
65 mph (104.61 km/h)62.94 mph (101.29 km/h)
70 mph (112.65 km/h)67.78 mph (109.08 km/h)
75 mph (120.7 km/h)72.62 mph (116.87 km/h)
80 mph (128.75 km/h)77.46 mph (124.67 km/h)
85 mph (136.79 km/h)82.31 mph (132.46 km/h)
90 mph (144.84 km/h)87.15 mph (140.25 km/h)
95 mph (152.89 km/h)91.99 mph (148.04 km/h)
100 mph (160.93 km/h)96.83 mph (155.83 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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