Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
255/30r19 vs 265/30r19 Tire Comparison Side By Side
  255/30-19 265/30-19 Difference
Diameter inches (mm) 25.02 (635.6) 25.26 (641.6) 0.24 (6) 0.9%
Width inches (mm) 10.04 (255) 10.43 (265) 0.39 (10) 3.9%
Circum. inches (mm) 78.61 (1996.8) 79.36 (2015.65) 0.74 (18.85) 0.9%
Sidewall Height inches (mm) 3.01 (76.5) 3.13 (79.5) 0.12 (3) 3.9%
Revolutions per mile (km) 805.96 (500.8) 798.43 (496.12) -7.54 (-4.68) -0.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.19 mph (32.49 km/h)
25 mph (40.23 km/h)25.24 mph (40.61 km/h)
30 mph (48.28 km/h)30.28 mph (48.74 km/h)
35 mph (56.33 km/h)35.33 mph (56.86 km/h)
40 mph (64.37 km/h)40.38 mph (64.98 km/h)
45 mph (72.42 km/h)45.42 mph (73.1 km/h)
50 mph (80.47 km/h)50.47 mph (81.23 km/h)
55 mph (88.51 km/h)55.52 mph (89.35 km/h)
60 mph (96.56 km/h)60.57 mph (97.47 km/h)
65 mph (104.61 km/h)65.61 mph (105.6 km/h)
70 mph (112.65 km/h)70.66 mph (113.72 km/h)
75 mph (120.7 km/h)75.71 mph (121.84 km/h)
80 mph (128.75 km/h)80.76 mph (129.96 km/h)
85 mph (136.79 km/h)85.8 mph (138.09 km/h)
90 mph (144.84 km/h)90.85 mph (146.21 km/h)
95 mph (152.89 km/h)95.9 mph (154.33 km/h)
100 mph (160.93 km/h)100.94 mph (162.45 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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