Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
155/70r13 vs 165/65r14 Tire Comparison Side By Side
  155/70-13 165/65-14 Difference
Diameter inches (mm) 21.54 (547.2) 22.44 (570.1) 0.9 (22.9) 4.2%
Width inches (mm) 6.1 (155) 6.5 (165) 0.39 (10) 6.5%
Circum. inches (mm) 67.68 (1719.08) 70.51 (1791.02) 2.83 (71.94) 4.2%
Sidewall Height inches (mm) 4.27 (108.5) 4.22 (107.25) -0.05 (-1.25) -1.2%
Revolutions per mile (km) 936.17 (581.71) 898.56 (558.34) -37.6 (-23.37) -4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.84 mph (33.53 km/h)
25 mph (40.23 km/h)26.05 mph (41.92 km/h)
30 mph (48.28 km/h)31.26 mph (50.3 km/h)
35 mph (56.33 km/h)36.46 mph (58.68 km/h)
40 mph (64.37 km/h)41.67 mph (67.07 km/h)
45 mph (72.42 km/h)46.88 mph (75.45 km/h)
50 mph (80.47 km/h)52.09 mph (83.83 km/h)
55 mph (88.51 km/h)57.3 mph (92.22 km/h)
60 mph (96.56 km/h)62.51 mph (100.6 km/h)
65 mph (104.61 km/h)67.72 mph (108.99 km/h)
70 mph (112.65 km/h)72.93 mph (117.37 km/h)
75 mph (120.7 km/h)78.14 mph (125.75 km/h)
80 mph (128.75 km/h)83.35 mph (134.14 km/h)
85 mph (136.79 km/h)88.56 mph (142.52 km/h)
90 mph (144.84 km/h)93.77 mph (150.9 km/h)
95 mph (152.89 km/h)98.98 mph (159.29 km/h)
100 mph (160.93 km/h)104.18 mph (167.67 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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