Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
145/65r14 vs 165/65r14 Tire Comparison Side By Side
  145/65-14 165/65-14 Difference
Diameter inches (mm) 21.42 (544.1) 22.44 (570.1) 1.02 (26) 4.8%
Width inches (mm) 5.71 (145) 6.5 (165) 0.79 (20) 13.8%
Circum. inches (mm) 67.3 (1709.34) 70.51 (1791.02) 3.22 (81.68) 4.8%
Sidewall Height inches (mm) 3.71 (94.25) 4.22 (107.25) 0.51 (13) 13.8%
Revolutions per mile (km) 941.5 (585.02) 898.56 (558.34) -42.94 (-26.68) -4.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.96 mph (33.73 km/h)
25 mph (40.23 km/h)26.19 mph (42.16 km/h)
30 mph (48.28 km/h)31.43 mph (50.59 km/h)
35 mph (56.33 km/h)36.67 mph (59.02 km/h)
40 mph (64.37 km/h)41.91 mph (67.45 km/h)
45 mph (72.42 km/h)47.15 mph (75.88 km/h)
50 mph (80.47 km/h)52.39 mph (84.31 km/h)
55 mph (88.51 km/h)57.63 mph (92.74 km/h)
60 mph (96.56 km/h)62.87 mph (101.18 km/h)
65 mph (104.61 km/h)68.11 mph (109.61 km/h)
70 mph (112.65 km/h)73.34 mph (118.04 km/h)
75 mph (120.7 km/h)78.58 mph (126.47 km/h)
80 mph (128.75 km/h)83.82 mph (134.9 km/h)
85 mph (136.79 km/h)89.06 mph (143.33 km/h)
90 mph (144.84 km/h)94.3 mph (151.76 km/h)
95 mph (152.89 km/h)99.54 mph (160.19 km/h)
100 mph (160.93 km/h)104.78 mph (168.63 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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