Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
165/65r13 vs 165/70r13 Tire Comparison Side By Side
  165/65-13 165/70-13 Difference
Diameter inches (mm) 21.44 (544.7) 22.09 (561.2) 0.65 (16.5) 3%
Width inches (mm) 6.5 (165) 6.5 (165) 0 (0) 0%
Circum. inches (mm) 67.37 (1711.23) 69.41 (1763.06) 2.04 (51.84) 3%
Sidewall Height inches (mm) 4.22 (107.25) 4.55 (115.5) 0.32 (8.25) 7.7%
Revolutions per mile (km) 940.46 (584.38) 912.81 (567.19) -27.65 (-17.18) -2.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.61 mph (33.16 km/h)
25 mph (40.23 km/h)25.76 mph (41.45 km/h)
30 mph (48.28 km/h)30.91 mph (49.74 km/h)
35 mph (56.33 km/h)36.06 mph (58.03 km/h)
40 mph (64.37 km/h)41.21 mph (66.32 km/h)
45 mph (72.42 km/h)46.36 mph (74.61 km/h)
50 mph (80.47 km/h)51.51 mph (82.9 km/h)
55 mph (88.51 km/h)56.67 mph (91.2 km/h)
60 mph (96.56 km/h)61.82 mph (99.49 km/h)
65 mph (104.61 km/h)66.97 mph (107.78 km/h)
70 mph (112.65 km/h)72.12 mph (116.07 km/h)
75 mph (120.7 km/h)77.27 mph (124.36 km/h)
80 mph (128.75 km/h)82.42 mph (132.65 km/h)
85 mph (136.79 km/h)87.57 mph (140.94 km/h)
90 mph (144.84 km/h)92.73 mph (149.23 km/h)
95 mph (152.89 km/h)97.88 mph (157.52 km/h)
100 mph (160.93 km/h)103.03 mph (165.81 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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