Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
175/80r13 vs 185/65r14 Tire Comparison Side By Side
  175/80-13 185/65-14 Difference
Diameter inches (mm) 24.02 (610.2) 23.47 (596.1) -0.56 (-14.1) -2.3%
Width inches (mm) 6.89 (175) 7.28 (185) 0.39 (10) 5.7%
Circum. inches (mm) 75.47 (1917) 73.73 (1872.7) -1.74 (-44.3) -2.3%
Sidewall Height inches (mm) 5.51 (140) 4.73 (120.25) -0.78 (-19.75) -14.1%
Revolutions per mile (km) 839.51 (521.65) 859.37 (533.99) 19.86 (12.34) 2.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.54 mph (31.44 km/h)
25 mph (40.23 km/h)24.42 mph (39.3 km/h)
30 mph (48.28 km/h)29.31 mph (47.16 km/h)
35 mph (56.33 km/h)34.19 mph (55.03 km/h)
40 mph (64.37 km/h)39.08 mph (62.89 km/h)
45 mph (72.42 km/h)43.96 mph (70.75 km/h)
50 mph (80.47 km/h)48.84 mph (78.61 km/h)
55 mph (88.51 km/h)53.73 mph (86.47 km/h)
60 mph (96.56 km/h)58.61 mph (94.33 km/h)
65 mph (104.61 km/h)63.5 mph (102.19 km/h)
70 mph (112.65 km/h)68.38 mph (110.05 km/h)
75 mph (120.7 km/h)73.27 mph (117.91 km/h)
80 mph (128.75 km/h)78.15 mph (125.77 km/h)
85 mph (136.79 km/h)83.04 mph (133.63 km/h)
90 mph (144.84 km/h)87.92 mph (141.49 km/h)
95 mph (152.89 km/h)92.8 mph (149.36 km/h)
100 mph (160.93 km/h)97.69 mph (157.22 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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