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 60/80r14 Tire Comparison Side By Side
  90/80-16 60/80-14 Difference
Diameter inches (mm) 21.67 (550.4) 17.78 (451.6) -3.89 (-98.8) -18%
Width inches (mm) 3.54 (90) 2.36 (60) -1.18 (-30) -33.3%
Circum. inches (mm) 68.08 (1729.13) 55.86 (1418.74) -12.22 (-310.39) -18%
Sidewall Height inches (mm) 2.83 (72) 1.89 (48) -0.94 (-24) -33.3%
Revolutions per mile (km) 930.72 (578.32) 1134.34 (704.85) 203.62 (126.52) 21.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)16.41 mph (26.41 km/h)
25 mph (40.23 km/h)20.51 mph (33.01 km/h)
30 mph (48.28 km/h)24.61 mph (39.61 km/h)
35 mph (56.33 km/h)28.72 mph (46.22 km/h)
40 mph (64.37 km/h)32.82 mph (52.82 km/h)
45 mph (72.42 km/h)36.92 mph (59.42 km/h)
50 mph (80.47 km/h)41.02 mph (66.02 km/h)
55 mph (88.51 km/h)45.13 mph (72.63 km/h)
60 mph (96.56 km/h)49.23 mph (79.23 km/h)
65 mph (104.61 km/h)53.33 mph (85.83 km/h)
70 mph (112.65 km/h)57.43 mph (92.43 km/h)
75 mph (120.7 km/h)61.54 mph (99.03 km/h)
80 mph (128.75 km/h)65.64 mph (105.64 km/h)
85 mph (136.79 km/h)69.74 mph (112.24 km/h)
90 mph (144.84 km/h)73.84 mph (118.84 km/h)
95 mph (152.89 km/h)77.95 mph (125.44 km/h)
100 mph (160.93 km/h)82.05 mph (132.05 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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