Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
165/55r16 vs 165/55r15 Tire Comparison Side By Side
  165/55-16 165/55-15 Difference
Diameter inches (mm) 23.15 (587.9) 22.15 (562.5) -1 (-25.4) -4.3%
Width inches (mm) 6.5 (165) 6.5 (165) 0 (0) 0%
Circum. inches (mm) 72.71 (1846.94) 69.57 (1767.15) -3.14 (-79.8) -4.3%
Sidewall Height inches (mm) 3.57 (90.75) 3.57 (90.75) 0 (0) 0%
Revolutions per mile (km) 871.36 (541.43) 910.7 (565.88) 39.35 (24.45) 4.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.14 mph (30.8 km/h)
25 mph (40.23 km/h)23.92 mph (38.5 km/h)
30 mph (48.28 km/h)28.7 mph (46.19 km/h)
35 mph (56.33 km/h)33.49 mph (53.89 km/h)
40 mph (64.37 km/h)38.27 mph (61.59 km/h)
45 mph (72.42 km/h)43.06 mph (69.29 km/h)
50 mph (80.47 km/h)47.84 mph (76.99 km/h)
55 mph (88.51 km/h)52.62 mph (84.69 km/h)
60 mph (96.56 km/h)57.41 mph (92.39 km/h)
65 mph (104.61 km/h)62.19 mph (100.09 km/h)
70 mph (112.65 km/h)66.98 mph (107.79 km/h)
75 mph (120.7 km/h)71.76 mph (115.49 km/h)
80 mph (128.75 km/h)76.54 mph (123.19 km/h)
85 mph (136.79 km/h)81.33 mph (130.88 km/h)
90 mph (144.84 km/h)86.11 mph (138.58 km/h)
95 mph (152.89 km/h)90.9 mph (146.28 km/h)
100 mph (160.93 km/h)95.68 mph (153.98 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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