Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
180/80r13 vs 175/75r13 Tire Comparison Side By Side
  180/80-13 175/75-13 Difference
Diameter inches (mm) 24.34 (618.2) 23.33 (592.7) -1 (-25.5) -4.1%
Width inches (mm) 7.09 (180) 6.89 (175) -0.2 (-5) -2.8%
Circum. inches (mm) 76.46 (1942.13) 73.31 (1862.02) -3.15 (-80.11) -4.1%
Sidewall Height inches (mm) 5.67 (144) 5.17 (131.25) -0.5 (-12.75) -8.9%
Revolutions per mile (km) 828.65 (514.9) 864.3 (537.05) 35.65 (22.15) 4.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.18 mph (30.86 km/h)
25 mph (40.23 km/h)23.97 mph (38.57 km/h)
30 mph (48.28 km/h)28.76 mph (46.29 km/h)
35 mph (56.33 km/h)33.56 mph (54 km/h)
40 mph (64.37 km/h)38.35 mph (61.72 km/h)
45 mph (72.42 km/h)43.14 mph (69.43 km/h)
50 mph (80.47 km/h)47.94 mph (77.15 km/h)
55 mph (88.51 km/h)52.73 mph (84.86 km/h)
60 mph (96.56 km/h)57.53 mph (92.58 km/h)
65 mph (104.61 km/h)62.32 mph (100.29 km/h)
70 mph (112.65 km/h)67.11 mph (108.01 km/h)
75 mph (120.7 km/h)71.91 mph (115.72 km/h)
80 mph (128.75 km/h)76.7 mph (123.44 km/h)
85 mph (136.79 km/h)81.49 mph (131.15 km/h)
90 mph (144.84 km/h)86.29 mph (138.87 km/h)
95 mph (152.89 km/h)91.08 mph (146.58 km/h)
100 mph (160.93 km/h)95.88 mph (154.3 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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