Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
165/60r15 vs 165/65r15 Tire Comparison Side By Side
  165/60-15 165/65-15 Difference
Diameter inches (mm) 22.8 (579) 23.44 (595.5) 0.65 (16.5) 2.8%
Width inches (mm) 6.5 (165) 6.5 (165) 0 (0) 0%
Circum. inches (mm) 71.61 (1818.98) 73.65 (1870.82) 2.04 (51.84) 2.8%
Sidewall Height inches (mm) 3.9 (99) 4.22 (107.25) 0.32 (8.25) 8.3%
Revolutions per mile (km) 884.75 (549.76) 860.24 (534.52) -24.51 (-15.23) -2.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.57 mph (33.1 km/h)
25 mph (40.23 km/h)25.71 mph (41.38 km/h)
30 mph (48.28 km/h)30.85 mph (49.66 km/h)
35 mph (56.33 km/h)36 mph (57.93 km/h)
40 mph (64.37 km/h)41.14 mph (66.21 km/h)
45 mph (72.42 km/h)46.28 mph (74.48 km/h)
50 mph (80.47 km/h)51.42 mph (82.76 km/h)
55 mph (88.51 km/h)56.57 mph (91.04 km/h)
60 mph (96.56 km/h)61.71 mph (99.31 km/h)
65 mph (104.61 km/h)66.85 mph (107.59 km/h)
70 mph (112.65 km/h)71.99 mph (115.86 km/h)
75 mph (120.7 km/h)77.14 mph (124.14 km/h)
80 mph (128.75 km/h)82.28 mph (132.42 km/h)
85 mph (136.79 km/h)87.42 mph (140.69 km/h)
90 mph (144.84 km/h)92.56 mph (148.97 km/h)
95 mph (152.89 km/h)97.71 mph (157.24 km/h)
100 mph (160.93 km/h)102.85 mph (165.52 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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