Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
245/40r19 vs 225/55r19 Tire Comparison Side By Side
  245/40-19 225/55-19 Difference
Diameter inches (mm) 26.72 (678.6) 28.74 (730.1) 2.03 (51.5) 7.6%
Width inches (mm) 9.65 (245) 8.86 (225) -0.79 (-20) -8.2%
Circum. inches (mm) 83.93 (2131.88) 90.3 (2293.68) 6.37 (161.79) 7.6%
Sidewall Height inches (mm) 3.86 (98) 4.87 (123.75) 1.01 (25.75) 26.3%
Revolutions per mile (km) 754.89 (469.07) 701.64 (435.98) -53.25 (-33.09) -7.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.52 mph (34.63 km/h)
25 mph (40.23 km/h)26.9 mph (43.29 km/h)
30 mph (48.28 km/h)32.28 mph (51.94 km/h)
35 mph (56.33 km/h)37.66 mph (60.6 km/h)
40 mph (64.37 km/h)43.04 mph (69.26 km/h)
45 mph (72.42 km/h)48.42 mph (77.92 km/h)
50 mph (80.47 km/h)53.79 mph (86.57 km/h)
55 mph (88.51 km/h)59.17 mph (95.23 km/h)
60 mph (96.56 km/h)64.55 mph (103.89 km/h)
65 mph (104.61 km/h)69.93 mph (112.55 km/h)
70 mph (112.65 km/h)75.31 mph (121.2 km/h)
75 mph (120.7 km/h)80.69 mph (129.86 km/h)
80 mph (128.75 km/h)86.07 mph (138.52 km/h)
85 mph (136.79 km/h)91.45 mph (147.18 km/h)
90 mph (144.84 km/h)96.83 mph (155.83 km/h)
95 mph (152.89 km/h)102.21 mph (164.49 km/h)
100 mph (160.93 km/h)107.59 mph (173.15 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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