Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
165/65r15 vs 165/60r15 Tire Comparison Side By Side
  165/65-15 165/60-15 Difference
Diameter inches (mm) 23.44 (595.5) 22.8 (579) -0.65 (-16.5) -2.8%
Width inches (mm) 6.5 (165) 6.5 (165) 0 (0) 0%
Circum. inches (mm) 73.65 (1870.82) 71.61 (1818.98) -2.04 (-51.84) -2.8%
Sidewall Height inches (mm) 4.22 (107.25) 3.9 (99) -0.32 (-8.25) -7.7%
Revolutions per mile (km) 860.24 (534.52) 884.75 (549.76) 24.51 (15.23) 2.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.45 mph (31.3 km/h)
25 mph (40.23 km/h)24.31 mph (39.12 km/h)
30 mph (48.28 km/h)29.17 mph (46.94 km/h)
35 mph (56.33 km/h)34.03 mph (54.77 km/h)
40 mph (64.37 km/h)38.89 mph (62.59 km/h)
45 mph (72.42 km/h)43.75 mph (70.41 km/h)
50 mph (80.47 km/h)48.61 mph (78.24 km/h)
55 mph (88.51 km/h)53.48 mph (86.06 km/h)
60 mph (96.56 km/h)58.34 mph (93.89 km/h)
65 mph (104.61 km/h)63.2 mph (101.71 km/h)
70 mph (112.65 km/h)68.06 mph (109.53 km/h)
75 mph (120.7 km/h)72.92 mph (117.36 km/h)
80 mph (128.75 km/h)77.78 mph (125.18 km/h)
85 mph (136.79 km/h)82.64 mph (133 km/h)
90 mph (144.84 km/h)87.51 mph (140.83 km/h)
95 mph (152.89 km/h)92.37 mph (148.65 km/h)
100 mph (160.93 km/h)97.23 mph (156.48 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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