Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
245/45r19 vs 275/45r19 Tire Comparison Side By Side
  245/45-19 275/45-19 Difference
Diameter inches (mm) 27.68 (703.1) 28.74 (730.1) 1.06 (27) 3.8%
Width inches (mm) 9.65 (245) 10.83 (275) 1.18 (30) 12.2%
Circum. inches (mm) 86.96 (2208.85) 90.3 (2293.68) 3.34 (84.82) 3.8%
Sidewall Height inches (mm) 4.34 (110.25) 4.87 (123.75) 0.53 (13.5) 12.2%
Revolutions per mile (km) 728.59 (452.72) 701.64 (435.98) -26.94 (-16.74) -3.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.77 mph (33.42 km/h)
25 mph (40.23 km/h)25.96 mph (41.78 km/h)
30 mph (48.28 km/h)31.15 mph (50.13 km/h)
35 mph (56.33 km/h)36.34 mph (58.49 km/h)
40 mph (64.37 km/h)41.54 mph (66.85 km/h)
45 mph (72.42 km/h)46.73 mph (75.2 km/h)
50 mph (80.47 km/h)51.92 mph (83.56 km/h)
55 mph (88.51 km/h)57.11 mph (91.91 km/h)
60 mph (96.56 km/h)62.3 mph (100.27 km/h)
65 mph (104.61 km/h)67.5 mph (108.62 km/h)
70 mph (112.65 km/h)72.69 mph (116.98 km/h)
75 mph (120.7 km/h)77.88 mph (125.34 km/h)
80 mph (128.75 km/h)83.07 mph (133.69 km/h)
85 mph (136.79 km/h)88.26 mph (142.05 km/h)
90 mph (144.84 km/h)93.46 mph (150.4 km/h)
95 mph (152.89 km/h)98.65 mph (158.76 km/h)
100 mph (160.93 km/h)103.84 mph (167.11 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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