Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
325/30r19 vs 275/40r19 Tire Comparison Side By Side
  325/30-19 275/40-19 Difference
Diameter inches (mm) 26.68 (677.6) 27.66 (702.6) 0.98 (25) 3.7%
Width inches (mm) 12.8 (325) 10.83 (275) -1.97 (-50) -15.4%
Circum. inches (mm) 83.81 (2128.74) 86.9 (2207.28) 3.09 (78.54) 3.7%
Sidewall Height inches (mm) 3.84 (97.5) 4.33 (110) 0.49 (12.5) 12.8%
Revolutions per mile (km) 756.01 (469.76) 729.11 (453.04) -26.9 (-16.72) -3.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.74 mph (33.37 km/h)
25 mph (40.23 km/h)25.92 mph (41.72 km/h)
30 mph (48.28 km/h)31.11 mph (50.06 km/h)
35 mph (56.33 km/h)36.29 mph (58.41 km/h)
40 mph (64.37 km/h)41.48 mph (66.75 km/h)
45 mph (72.42 km/h)46.66 mph (75.09 km/h)
50 mph (80.47 km/h)51.84 mph (83.44 km/h)
55 mph (88.51 km/h)57.03 mph (91.78 km/h)
60 mph (96.56 km/h)62.21 mph (100.12 km/h)
65 mph (104.61 km/h)67.4 mph (108.47 km/h)
70 mph (112.65 km/h)72.58 mph (116.81 km/h)
75 mph (120.7 km/h)77.77 mph (125.15 km/h)
80 mph (128.75 km/h)82.95 mph (133.5 km/h)
85 mph (136.79 km/h)88.14 mph (141.84 km/h)
90 mph (144.84 km/h)93.32 mph (150.19 km/h)
95 mph (152.89 km/h)98.51 mph (158.53 km/h)
100 mph (160.93 km/h)103.69 mph (166.87 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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