Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
90/80r16 vs 70/90r16 Tire Comparison Side By Side
  90/80-16 70/90-16 Difference
Diameter inches (mm) 21.67 (550.4) 20.96 (532.4) -0.71 (-18) -3.3%
Width inches (mm) 3.54 (90) 2.76 (70) -0.79 (-20) -22.2%
Circum. inches (mm) 68.08 (1729.13) 65.85 (1672.58) -2.23 (-56.55) -3.3%
Sidewall Height inches (mm) 2.83 (72) 2.48 (63) -0.35 (-9) -12.5%
Revolutions per mile (km) 930.72 (578.32) 962.19 (597.88) 31.47 (19.55) 3.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.35 mph (31.13 km/h)
25 mph (40.23 km/h)24.18 mph (38.92 km/h)
30 mph (48.28 km/h)29.02 mph (46.7 km/h)
35 mph (56.33 km/h)33.86 mph (54.49 km/h)
40 mph (64.37 km/h)38.69 mph (62.27 km/h)
45 mph (72.42 km/h)43.53 mph (70.05 km/h)
50 mph (80.47 km/h)48.36 mph (77.84 km/h)
55 mph (88.51 km/h)53.2 mph (85.62 km/h)
60 mph (96.56 km/h)58.04 mph (93.4 km/h)
65 mph (104.61 km/h)62.87 mph (101.19 km/h)
70 mph (112.65 km/h)67.71 mph (108.97 km/h)
75 mph (120.7 km/h)72.55 mph (116.75 km/h)
80 mph (128.75 km/h)77.38 mph (124.54 km/h)
85 mph (136.79 km/h)82.22 mph (132.32 km/h)
90 mph (144.84 km/h)87.06 mph (140.1 km/h)
95 mph (152.89 km/h)91.89 mph (147.89 km/h)
100 mph (160.93 km/h)96.73 mph (155.67 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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