Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
165/90r17 vs 245/50r19 Tire Comparison Side By Side
  165/90-17 245/50-19 Difference
Diameter inches (mm) 28.69 (728.8) 28.65 (727.6) -0.05 (-1.2) -0.2%
Width inches (mm) 6.5 (165) 9.65 (245) 3.15 (80) 48.5%
Circum. inches (mm) 90.14 (2289.59) 89.99 (2285.82) -0.15 (-3.77) -0.2%
Sidewall Height inches (mm) 5.85 (148.5) 4.82 (122.5) -1.02 (-26) -17.5%
Revolutions per mile (km) 702.9 (436.76) 704.05 (437.48) 1.16 (0.72) 0.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.97 mph (32.13 km/h)
25 mph (40.23 km/h)24.96 mph (40.17 km/h)
30 mph (48.28 km/h)29.95 mph (48.2 km/h)
35 mph (56.33 km/h)34.94 mph (56.23 km/h)
40 mph (64.37 km/h)39.93 mph (64.27 km/h)
45 mph (72.42 km/h)44.93 mph (72.3 km/h)
50 mph (80.47 km/h)49.92 mph (80.33 km/h)
55 mph (88.51 km/h)54.91 mph (88.37 km/h)
60 mph (96.56 km/h)59.9 mph (96.4 km/h)
65 mph (104.61 km/h)64.89 mph (104.44 km/h)
70 mph (112.65 km/h)69.88 mph (112.47 km/h)
75 mph (120.7 km/h)74.88 mph (120.5 km/h)
80 mph (128.75 km/h)79.87 mph (128.54 km/h)
85 mph (136.79 km/h)84.86 mph (136.57 km/h)
90 mph (144.84 km/h)89.85 mph (144.6 km/h)
95 mph (152.89 km/h)94.84 mph (152.64 km/h)
100 mph (160.93 km/h)99.84 mph (160.67 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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