Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
165/60r12 vs 165/60r13 Tire Comparison Side By Side
  165/60-12 165/60-13 Difference
Diameter inches (mm) 19.8 (502.8) 20.8 (528.2) 1 (25.4) 5.1%
Width inches (mm) 6.5 (165) 6.5 (165) 0 (0) 0%
Circum. inches (mm) 62.19 (1579.59) 65.33 (1659.39) 3.14 (79.8) 5.1%
Sidewall Height inches (mm) 3.9 (99) 3.9 (99) 0 (0) 0%
Revolutions per mile (km) 1018.83 (633.07) 969.84 (602.63) -48.99 (-30.44) -4.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.01 mph (33.81 km/h)
25 mph (40.23 km/h)26.26 mph (42.27 km/h)
30 mph (48.28 km/h)31.52 mph (50.72 km/h)
35 mph (56.33 km/h)36.77 mph (59.17 km/h)
40 mph (64.37 km/h)42.02 mph (67.63 km/h)
45 mph (72.42 km/h)47.27 mph (76.08 km/h)
50 mph (80.47 km/h)52.53 mph (84.53 km/h)
55 mph (88.51 km/h)57.78 mph (92.99 km/h)
60 mph (96.56 km/h)63.03 mph (101.44 km/h)
65 mph (104.61 km/h)68.28 mph (109.89 km/h)
70 mph (112.65 km/h)73.54 mph (118.35 km/h)
75 mph (120.7 km/h)78.79 mph (126.8 km/h)
80 mph (128.75 km/h)84.04 mph (135.25 km/h)
85 mph (136.79 km/h)89.29 mph (143.7 km/h)
90 mph (144.84 km/h)94.55 mph (152.16 km/h)
95 mph (152.89 km/h)99.8 mph (160.61 km/h)
100 mph (160.93 km/h)105.05 mph (169.06 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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