Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
185/55r14 vs 165/70r14 Tire Comparison Side By Side
  185/55-14 165/70-14 Difference
Diameter inches (mm) 22.01 (559.1) 23.09 (586.6) 1.08 (27.5) 4.9%
Width inches (mm) 7.28 (185) 6.5 (165) -0.79 (-20) -10.8%
Circum. inches (mm) 69.15 (1756.46) 72.55 (1842.86) 3.4 (86.39) 4.9%
Sidewall Height inches (mm) 4.01 (101.75) 4.55 (115.5) 0.54 (13.75) 13.5%
Revolutions per mile (km) 916.24 (569.32) 873.29 (542.63) -42.95 (-26.69) -4.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.98 mph (33.77 km/h)
25 mph (40.23 km/h)26.23 mph (42.21 km/h)
30 mph (48.28 km/h)31.48 mph (50.66 km/h)
35 mph (56.33 km/h)36.72 mph (59.1 km/h)
40 mph (64.37 km/h)41.97 mph (67.54 km/h)
45 mph (72.42 km/h)47.21 mph (75.98 km/h)
50 mph (80.47 km/h)52.46 mph (84.43 km/h)
55 mph (88.51 km/h)57.71 mph (92.87 km/h)
60 mph (96.56 km/h)62.95 mph (101.31 km/h)
65 mph (104.61 km/h)68.2 mph (109.75 km/h)
70 mph (112.65 km/h)73.44 mph (118.2 km/h)
75 mph (120.7 km/h)78.69 mph (126.64 km/h)
80 mph (128.75 km/h)83.93 mph (135.08 km/h)
85 mph (136.79 km/h)89.18 mph (143.52 km/h)
90 mph (144.84 km/h)94.43 mph (151.97 km/h)
95 mph (152.89 km/h)99.67 mph (160.41 km/h)
100 mph (160.93 km/h)104.92 mph (168.85 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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