Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
245/50r19 vs 225/65r17 Tire Comparison Side By Side
  245/50-19 225/65-17 Difference
Diameter inches (mm) 28.65 (727.6) 28.52 (724.3) -0.13 (-3.3) -0.5%
Width inches (mm) 9.65 (245) 8.86 (225) -0.79 (-20) -8.2%
Circum. inches (mm) 89.99 (2285.82) 89.58 (2275.46) -0.41 (-10.37) -0.5%
Sidewall Height inches (mm) 4.82 (122.5) 5.76 (146.25) 0.94 (23.75) 19.4%
Revolutions per mile (km) 704.05 (437.48) 707.26 (439.47) 3.21 (1.99) 0.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.91 mph (32.04 km/h)
25 mph (40.23 km/h)24.89 mph (40.05 km/h)
30 mph (48.28 km/h)29.86 mph (48.06 km/h)
35 mph (56.33 km/h)34.84 mph (56.07 km/h)
40 mph (64.37 km/h)39.82 mph (64.08 km/h)
45 mph (72.42 km/h)44.8 mph (72.09 km/h)
50 mph (80.47 km/h)49.77 mph (80.1 km/h)
55 mph (88.51 km/h)54.75 mph (88.11 km/h)
60 mph (96.56 km/h)59.73 mph (96.12 km/h)
65 mph (104.61 km/h)64.71 mph (104.13 km/h)
70 mph (112.65 km/h)69.68 mph (112.14 km/h)
75 mph (120.7 km/h)74.66 mph (120.15 km/h)
80 mph (128.75 km/h)79.64 mph (128.16 km/h)
85 mph (136.79 km/h)84.61 mph (136.17 km/h)
90 mph (144.84 km/h)89.59 mph (144.18 km/h)
95 mph (152.89 km/h)94.57 mph (152.19 km/h)
100 mph (160.93 km/h)99.55 mph (160.2 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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