Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
100/85r19 vs 205/45r19 Tire Comparison Side By Side
  100/85-19 205/45-19 Difference
Diameter inches (mm) 25.69 (652.6) 26.26 (667.1) 0.57 (14.5) 2.2%
Width inches (mm) 3.94 (100) 8.07 (205) 4.13 (105) 105%
Circum. inches (mm) 80.72 (2050.2) 82.51 (2095.76) 1.79 (45.55) 2.2%
Sidewall Height inches (mm) 3.35 (85) 3.63 (92.25) 0.29 (7.25) 8.5%
Revolutions per mile (km) 784.97 (487.76) 767.91 (477.15) -17.06 (-10.6) -2.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.44 mph (32.9 km/h)
25 mph (40.23 km/h)25.56 mph (41.13 km/h)
30 mph (48.28 km/h)30.67 mph (49.35 km/h)
35 mph (56.33 km/h)35.78 mph (57.58 km/h)
40 mph (64.37 km/h)40.89 mph (65.8 km/h)
45 mph (72.42 km/h)46 mph (74.03 km/h)
50 mph (80.47 km/h)51.11 mph (82.26 km/h)
55 mph (88.51 km/h)56.22 mph (90.48 km/h)
60 mph (96.56 km/h)61.33 mph (98.71 km/h)
65 mph (104.61 km/h)66.44 mph (106.93 km/h)
70 mph (112.65 km/h)71.56 mph (115.16 km/h)
75 mph (120.7 km/h)76.67 mph (123.38 km/h)
80 mph (128.75 km/h)81.78 mph (131.61 km/h)
85 mph (136.79 km/h)86.89 mph (139.83 km/h)
90 mph (144.84 km/h)92 mph (148.06 km/h)
95 mph (152.89 km/h)97.11 mph (156.28 km/h)
100 mph (160.93 km/h)102.22 mph (164.51 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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