Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
205/55r16 vs 205/55r15 Tire Comparison Side By Side
  205/55-16 205/55-15 Difference
Diameter inches (mm) 24.88 (631.9) 23.88 (606.5) -1 (-25.4) -4%
Width inches (mm) 8.07 (205) 8.07 (205) 0 (0) 0%
Circum. inches (mm) 78.16 (1985.17) 75.01 (1905.38) -3.14 (-79.8) -4%
Sidewall Height inches (mm) 4.44 (112.75) 4.44 (112.75) 0 (0) 0%
Revolutions per mile (km) 810.68 (503.73) 844.63 (524.83) 33.95 (21.1) 4.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.2 mph (30.89 km/h)
25 mph (40.23 km/h)24 mph (38.62 km/h)
30 mph (48.28 km/h)28.79 mph (46.34 km/h)
35 mph (56.33 km/h)33.59 mph (54.06 km/h)
40 mph (64.37 km/h)38.39 mph (61.79 km/h)
45 mph (72.42 km/h)43.19 mph (69.51 km/h)
50 mph (80.47 km/h)47.99 mph (77.23 km/h)
55 mph (88.51 km/h)52.79 mph (84.96 km/h)
60 mph (96.56 km/h)57.59 mph (92.68 km/h)
65 mph (104.61 km/h)62.39 mph (100.4 km/h)
70 mph (112.65 km/h)67.19 mph (108.13 km/h)
75 mph (120.7 km/h)71.99 mph (115.85 km/h)
80 mph (128.75 km/h)76.78 mph (123.57 km/h)
85 mph (136.79 km/h)81.58 mph (131.3 km/h)
90 mph (144.84 km/h)86.38 mph (139.02 km/h)
95 mph (152.89 km/h)91.18 mph (146.74 km/h)
100 mph (160.93 km/h)95.98 mph (154.47 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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