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 165/55r13 Tire Comparison Side By Side
  145/80-10 165/55-13 Difference
Diameter inches (mm) 19.13 (486) 20.15 (511.7) 1.01 (25.7) 5.3%
Width inches (mm) 5.71 (145) 6.5 (165) 0.79 (20) 13.8%
Circum. inches (mm) 60.11 (1526.81) 63.29 (1607.55) 3.18 (80.74) 5.3%
Sidewall Height inches (mm) 4.57 (116) 3.57 (90.75) -0.99 (-25.25) -21.8%
Revolutions per mile (km) 1054.05 (654.96) 1001.11 (622.06) -52.94 (-32.9) -5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.06 mph (33.89 km/h)
25 mph (40.23 km/h)26.32 mph (42.36 km/h)
30 mph (48.28 km/h)31.59 mph (50.83 km/h)
35 mph (56.33 km/h)36.85 mph (59.31 km/h)
40 mph (64.37 km/h)42.12 mph (67.78 km/h)
45 mph (72.42 km/h)47.38 mph (76.25 km/h)
50 mph (80.47 km/h)52.64 mph (84.72 km/h)
55 mph (88.51 km/h)57.91 mph (93.19 km/h)
60 mph (96.56 km/h)63.17 mph (101.67 km/h)
65 mph (104.61 km/h)68.44 mph (110.14 km/h)
70 mph (112.65 km/h)73.7 mph (118.61 km/h)
75 mph (120.7 km/h)78.97 mph (127.08 km/h)
80 mph (128.75 km/h)84.23 mph (135.56 km/h)
85 mph (136.79 km/h)89.49 mph (144.03 km/h)
90 mph (144.84 km/h)94.76 mph (152.5 km/h)
95 mph (152.89 km/h)100.02 mph (160.97 km/h)
100 mph (160.93 km/h)105.29 mph (169.45 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
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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