Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
255/45r19 vs 245/30r19 Tire Comparison Side By Side
  255/45-19 245/30-19 Difference
Diameter inches (mm) 28.04 (712.1) 24.79 (629.6) -3.25 (-82.5) -11.6%
Width inches (mm) 10.04 (255) 9.65 (245) -0.39 (-10) -3.9%
Circum. inches (mm) 88.08 (2237.13) 77.87 (1977.95) -10.2 (-259.18) -11.6%
Sidewall Height inches (mm) 4.52 (114.75) 2.89 (73.5) -1.62 (-41.25) -35.9%
Revolutions per mile (km) 719.38 (447) 813.64 (505.57) 94.26 (58.57) 13.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)17.68 mph (28.46 km/h)
25 mph (40.23 km/h)22.1 mph (35.57 km/h)
30 mph (48.28 km/h)26.52 mph (42.69 km/h)
35 mph (56.33 km/h)30.95 mph (49.8 km/h)
40 mph (64.37 km/h)35.37 mph (56.92 km/h)
45 mph (72.42 km/h)39.79 mph (64.03 km/h)
50 mph (80.47 km/h)44.21 mph (71.14 km/h)
55 mph (88.51 km/h)48.63 mph (78.26 km/h)
60 mph (96.56 km/h)53.05 mph (85.37 km/h)
65 mph (104.61 km/h)57.47 mph (92.49 km/h)
70 mph (112.65 km/h)61.89 mph (99.6 km/h)
75 mph (120.7 km/h)66.31 mph (106.72 km/h)
80 mph (128.75 km/h)70.73 mph (113.83 km/h)
85 mph (136.79 km/h)75.15 mph (120.95 km/h)
90 mph (144.84 km/h)79.57 mph (128.06 km/h)
95 mph (152.89 km/h)83.99 mph (135.18 km/h)
100 mph (160.93 km/h)88.41 mph (142.29 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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