Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
175/75r16 vs 250/80r16 Tire Comparison Side By Side
  175/75-16 250/80-16 Difference
Diameter inches (mm) 26.33 (668.9) 31.75 (806.4) 5.41 (137.5) 20.6%
Width inches (mm) 6.89 (175) 9.84 (250) 2.95 (75) 42.9%
Circum. inches (mm) 82.73 (2101.41) 99.74 (2533.38) 17.01 (431.97) 20.6%
Sidewall Height inches (mm) 5.17 (131.25) 7.87 (200) 2.71 (68.75) 52.4%
Revolutions per mile (km) 765.84 (475.87) 635.26 (394.73) -130.58 (-81.14) -17.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)24.11 mph (38.8 km/h)
25 mph (40.23 km/h)30.14 mph (48.5 km/h)
30 mph (48.28 km/h)36.17 mph (58.21 km/h)
35 mph (56.33 km/h)42.19 mph (67.91 km/h)
40 mph (64.37 km/h)48.22 mph (77.61 km/h)
45 mph (72.42 km/h)54.25 mph (87.31 km/h)
50 mph (80.47 km/h)60.28 mph (97.01 km/h)
55 mph (88.51 km/h)66.31 mph (106.71 km/h)
60 mph (96.56 km/h)72.33 mph (116.41 km/h)
65 mph (104.61 km/h)78.36 mph (126.11 km/h)
70 mph (112.65 km/h)84.39 mph (135.81 km/h)
75 mph (120.7 km/h)90.42 mph (145.51 km/h)
80 mph (128.75 km/h)96.44 mph (155.21 km/h)
85 mph (136.79 km/h)102.47 mph (164.91 km/h)
90 mph (144.84 km/h)108.5 mph (174.62 km/h)
95 mph (152.89 km/h)114.53 mph (184.32 km/h)
100 mph (160.93 km/h)120.56 mph (194.02 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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