Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
90/90r18 vs 80/90r18 Tire Comparison Side By Side
  90/90-18 80/90-18 Difference
Diameter inches (mm) 24.38 (619.2) 23.67 (601.2) -0.71 (-18) -2.9%
Width inches (mm) 3.54 (90) 3.15 (80) -0.39 (-10) -11.1%
Circum. inches (mm) 76.59 (1945.27) 74.36 (1888.73) -2.23 (-56.55) -2.9%
Sidewall Height inches (mm) 3.19 (81) 2.83 (72) -0.35 (-9) -11.1%
Revolutions per mile (km) 827.31 (514.07) 852.08 (529.46) 24.77 (15.39) 3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.42 mph (31.25 km/h)
25 mph (40.23 km/h)24.27 mph (39.06 km/h)
30 mph (48.28 km/h)29.13 mph (46.88 km/h)
35 mph (56.33 km/h)33.98 mph (54.69 km/h)
40 mph (64.37 km/h)38.84 mph (62.5 km/h)
45 mph (72.42 km/h)43.69 mph (70.32 km/h)
50 mph (80.47 km/h)48.55 mph (78.13 km/h)
55 mph (88.51 km/h)53.4 mph (85.94 km/h)
60 mph (96.56 km/h)58.26 mph (93.75 km/h)
65 mph (104.61 km/h)63.11 mph (101.57 km/h)
70 mph (112.65 km/h)67.97 mph (109.38 km/h)
75 mph (120.7 km/h)72.82 mph (117.19 km/h)
80 mph (128.75 km/h)77.67 mph (125.01 km/h)
85 mph (136.79 km/h)82.53 mph (132.82 km/h)
90 mph (144.84 km/h)87.38 mph (140.63 km/h)
95 mph (152.89 km/h)92.24 mph (148.44 km/h)
100 mph (160.93 km/h)97.09 mph (156.26 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
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