Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
155/80r19 vs 245/75r18 Tire Comparison Side By Side
  155/80-19 245/75-18 Difference
Diameter inches (mm) 28.76 (730.6) 32.47 (824.7) 3.7 (94.1) 12.9%
Width inches (mm) 6.1 (155) 9.65 (245) 3.54 (90) 58.1%
Circum. inches (mm) 90.36 (2295.25) 102 (2590.87) 11.64 (295.62) 12.9%
Sidewall Height inches (mm) 4.88 (124) 7.23 (183.75) 2.35 (59.75) 48.2%
Revolutions per mile (km) 701.16 (435.68) 621.16 (385.97) -80 (-49.71) -11.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)22.58 mph (36.33 km/h)
25 mph (40.23 km/h)28.22 mph (45.42 km/h)
30 mph (48.28 km/h)33.86 mph (54.5 km/h)
35 mph (56.33 km/h)39.51 mph (63.58 km/h)
40 mph (64.37 km/h)45.15 mph (72.67 km/h)
45 mph (72.42 km/h)50.8 mph (81.75 km/h)
50 mph (80.47 km/h)56.44 mph (90.83 km/h)
55 mph (88.51 km/h)62.08 mph (99.91 km/h)
60 mph (96.56 km/h)67.73 mph (109 km/h)
65 mph (104.61 km/h)73.37 mph (118.08 km/h)
70 mph (112.65 km/h)79.02 mph (127.16 km/h)
75 mph (120.7 km/h)84.66 mph (136.25 km/h)
80 mph (128.75 km/h)90.3 mph (145.33 km/h)
85 mph (136.79 km/h)95.95 mph (154.41 km/h)
90 mph (144.84 km/h)101.59 mph (163.5 km/h)
95 mph (152.89 km/h)107.24 mph (172.58 km/h)
100 mph (160.93 km/h)112.88 mph (181.66 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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