Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
225/70r19.5 vs 265/70r19.5 Tire Comparison Side By Side
  225/70-19.5 265/70-19.5 Difference
Diameter inches (mm) 31.9 (810.3) 34.11 (866.3) 2.2 (56) 6.9%
Width inches (mm) 8.86 (225) 10.43 (265) 1.57 (40) 17.8%
Circum. inches (mm) 100.22 (2545.63) 107.15 (2721.56) 6.93 (175.93) 6.9%
Sidewall Height inches (mm) 6.2 (157.5) 7.3 (185.5) 1.1 (28) 17.8%
Revolutions per mile (km) 632.2 (392.83) 591.33 (367.44) -40.87 (-25.39) -6.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.38 mph (34.41 km/h)
25 mph (40.23 km/h)26.73 mph (43.01 km/h)
30 mph (48.28 km/h)32.07 mph (51.62 km/h)
35 mph (56.33 km/h)37.42 mph (60.22 km/h)
40 mph (64.37 km/h)42.76 mph (68.82 km/h)
45 mph (72.42 km/h)48.11 mph (77.43 km/h)
50 mph (80.47 km/h)53.46 mph (86.03 km/h)
55 mph (88.51 km/h)58.8 mph (94.63 km/h)
60 mph (96.56 km/h)64.15 mph (103.23 km/h)
65 mph (104.61 km/h)69.49 mph (111.84 km/h)
70 mph (112.65 km/h)74.84 mph (120.44 km/h)
75 mph (120.7 km/h)80.18 mph (129.04 km/h)
80 mph (128.75 km/h)85.53 mph (137.65 km/h)
85 mph (136.79 km/h)90.87 mph (146.25 km/h)
90 mph (144.84 km/h)96.22 mph (154.85 km/h)
95 mph (152.89 km/h)101.57 mph (163.45 km/h)
100 mph (160.93 km/h)106.91 mph (172.06 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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