Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
145/80r10 vs 165/70r13 Tire Comparison Side By Side
  145/80-10 165/70-13 Difference
Diameter inches (mm) 19.13 (486) 22.09 (561.2) 2.96 (75.2) 15.5%
Width inches (mm) 5.71 (145) 6.5 (165) 0.79 (20) 13.8%
Circum. inches (mm) 60.11 (1526.81) 69.41 (1763.06) 9.3 (236.25) 15.5%
Sidewall Height inches (mm) 4.57 (116) 4.55 (115.5) -0.02 (-0.5) -0.4%
Revolutions per mile (km) 1054.05 (654.96) 912.81 (567.19) -141.24 (-87.76) -13.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)23.09 mph (37.17 km/h)
25 mph (40.23 km/h)28.87 mph (46.46 km/h)
30 mph (48.28 km/h)34.64 mph (55.75 km/h)
35 mph (56.33 km/h)40.42 mph (65.04 km/h)
40 mph (64.37 km/h)46.19 mph (74.33 km/h)
45 mph (72.42 km/h)51.96 mph (83.63 km/h)
50 mph (80.47 km/h)57.74 mph (92.92 km/h)
55 mph (88.51 km/h)63.51 mph (102.21 km/h)
60 mph (96.56 km/h)69.28 mph (111.5 km/h)
65 mph (104.61 km/h)75.06 mph (120.79 km/h)
70 mph (112.65 km/h)80.83 mph (130.09 km/h)
75 mph (120.7 km/h)86.6 mph (139.38 km/h)
80 mph (128.75 km/h)92.38 mph (148.67 km/h)
85 mph (136.79 km/h)98.15 mph (157.96 km/h)
90 mph (144.84 km/h)103.93 mph (167.25 km/h)
95 mph (152.89 km/h)109.7 mph (176.54 km/h)
100 mph (160.93 km/h)115.47 mph (185.84 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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