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 50/80r16 Tire Comparison Side By Side
  90/80-16 50/80-16 Difference
Diameter inches (mm) 21.67 (550.4) 19.15 (486.4) -2.52 (-64) -11.6%
Width inches (mm) 3.54 (90) 1.97 (50) -1.57 (-40) -44.4%
Circum. inches (mm) 68.08 (1729.13) 60.16 (1528.07) -7.92 (-201.06) -11.6%
Sidewall Height inches (mm) 2.83 (72) 1.57 (40) -1.26 (-32) -44.4%
Revolutions per mile (km) 930.72 (578.32) 1053.19 (654.42) 122.46 (76.1) 13.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)17.67 mph (28.44 km/h)
25 mph (40.23 km/h)22.09 mph (35.56 km/h)
30 mph (48.28 km/h)26.51 mph (42.67 km/h)
35 mph (56.33 km/h)30.93 mph (49.78 km/h)
40 mph (64.37 km/h)35.35 mph (56.89 km/h)
45 mph (72.42 km/h)39.77 mph (64 km/h)
50 mph (80.47 km/h)44.19 mph (71.11 km/h)
55 mph (88.51 km/h)48.6 mph (78.22 km/h)
60 mph (96.56 km/h)53.02 mph (85.33 km/h)
65 mph (104.61 km/h)57.44 mph (92.44 km/h)
70 mph (112.65 km/h)61.86 mph (99.55 km/h)
75 mph (120.7 km/h)66.28 mph (106.67 km/h)
80 mph (128.75 km/h)70.7 mph (113.78 km/h)
85 mph (136.79 km/h)75.12 mph (120.89 km/h)
90 mph (144.84 km/h)79.53 mph (128 km/h)
95 mph (152.89 km/h)83.95 mph (135.11 km/h)
100 mph (160.93 km/h)88.37 mph (142.22 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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