Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
145/80r19 vs 145/60r19 Tire Comparison Side By Side
  145/80-19 145/60-19 Difference
Diameter inches (mm) 28.13 (714.6) 25.85 (656.6) -2.28 (-58) -8.1%
Width inches (mm) 5.71 (145) 5.71 (145) 0 (0) 0%
Circum. inches (mm) 88.39 (2244.98) 81.21 (2062.77) -7.17 (-182.21) -8.1%
Sidewall Height inches (mm) 4.57 (116) 3.43 (87) -1.14 (-29) -25%
Revolutions per mile (km) 716.86 (445.44) 780.19 (484.78) 63.32 (39.35) 8.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.38 mph (29.57 km/h)
25 mph (40.23 km/h)22.97 mph (36.97 km/h)
30 mph (48.28 km/h)27.57 mph (44.36 km/h)
35 mph (56.33 km/h)32.16 mph (51.76 km/h)
40 mph (64.37 km/h)36.75 mph (59.15 km/h)
45 mph (72.42 km/h)41.35 mph (66.54 km/h)
50 mph (80.47 km/h)45.94 mph (73.94 km/h)
55 mph (88.51 km/h)50.54 mph (81.33 km/h)
60 mph (96.56 km/h)55.13 mph (88.72 km/h)
65 mph (104.61 km/h)59.72 mph (96.12 km/h)
70 mph (112.65 km/h)64.32 mph (103.51 km/h)
75 mph (120.7 km/h)68.91 mph (110.9 km/h)
80 mph (128.75 km/h)73.51 mph (118.3 km/h)
85 mph (136.79 km/h)78.1 mph (125.69 km/h)
90 mph (144.84 km/h)82.7 mph (133.09 km/h)
95 mph (152.89 km/h)87.29 mph (140.48 km/h)
100 mph (160.93 km/h)91.88 mph (147.87 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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