Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
145/80r13 vs 165/65r14 Tire Comparison Side By Side
  145/80-13 165/65-14 Difference
Diameter inches (mm) 22.13 (562.2) 22.44 (570.1) 0.31 (7.9) 1.4%
Width inches (mm) 5.71 (145) 6.5 (165) 0.79 (20) 13.8%
Circum. inches (mm) 69.54 (1766.2) 70.51 (1791.02) 0.98 (24.82) 1.4%
Sidewall Height inches (mm) 4.57 (116) 4.22 (107.25) -0.34 (-8.75) -7.5%
Revolutions per mile (km) 911.19 (566.19) 898.56 (558.34) -12.63 (-7.85) -1.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.28 mph (32.64 km/h)
25 mph (40.23 km/h)25.35 mph (40.8 km/h)
30 mph (48.28 km/h)30.42 mph (48.96 km/h)
35 mph (56.33 km/h)35.49 mph (57.12 km/h)
40 mph (64.37 km/h)40.56 mph (65.28 km/h)
45 mph (72.42 km/h)45.63 mph (73.44 km/h)
50 mph (80.47 km/h)50.7 mph (81.6 km/h)
55 mph (88.51 km/h)55.77 mph (89.76 km/h)
60 mph (96.56 km/h)60.84 mph (97.92 km/h)
65 mph (104.61 km/h)65.91 mph (106.08 km/h)
70 mph (112.65 km/h)70.98 mph (114.24 km/h)
75 mph (120.7 km/h)76.05 mph (122.4 km/h)
80 mph (128.75 km/h)81.12 mph (130.56 km/h)
85 mph (136.79 km/h)86.19 mph (138.72 km/h)
90 mph (144.84 km/h)91.26 mph (146.88 km/h)
95 mph (152.89 km/h)96.33 mph (155.04 km/h)
100 mph (160.93 km/h)101.41 mph (163.2 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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