Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
225/45r19 vs 255/45r19 Tire Comparison Side By Side
  225/45-19 255/45-19 Difference
Diameter inches (mm) 26.97 (685.1) 28.04 (712.1) 1.06 (27) 3.9%
Width inches (mm) 8.86 (225) 10.04 (255) 1.18 (30) 13.3%
Circum. inches (mm) 84.74 (2152.31) 88.08 (2237.13) 3.34 (84.82) 3.9%
Sidewall Height inches (mm) 3.99 (101.25) 4.52 (114.75) 0.53 (13.5) 13.3%
Revolutions per mile (km) 747.73 (464.62) 719.38 (447) -28.35 (-17.62) -3.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.79 mph (33.46 km/h)
25 mph (40.23 km/h)25.99 mph (41.82 km/h)
30 mph (48.28 km/h)31.18 mph (50.18 km/h)
35 mph (56.33 km/h)36.38 mph (58.55 km/h)
40 mph (64.37 km/h)41.58 mph (66.91 km/h)
45 mph (72.42 km/h)46.77 mph (75.27 km/h)
50 mph (80.47 km/h)51.97 mph (83.64 km/h)
55 mph (88.51 km/h)57.17 mph (92 km/h)
60 mph (96.56 km/h)62.36 mph (100.37 km/h)
65 mph (104.61 km/h)67.56 mph (108.73 km/h)
70 mph (112.65 km/h)72.76 mph (117.09 km/h)
75 mph (120.7 km/h)77.96 mph (125.46 km/h)
80 mph (128.75 km/h)83.15 mph (133.82 km/h)
85 mph (136.79 km/h)88.35 mph (142.19 km/h)
90 mph (144.84 km/h)93.55 mph (150.55 km/h)
95 mph (152.89 km/h)98.74 mph (158.91 km/h)
100 mph (160.93 km/h)103.94 mph (167.28 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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