Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
140/60r14 vs 140/50r14 Tire Comparison Side By Side
  140/60-14 140/50-14 Difference
Diameter inches (mm) 20.61 (523.6) 19.51 (495.6) -1.1 (-28) -5.3%
Width inches (mm) 5.51 (140) 5.51 (140) 0 (0) 0%
Circum. inches (mm) 64.76 (1644.94) 61.3 (1556.97) -3.46 (-87.96) -5.3%
Sidewall Height inches (mm) 3.31 (84) 2.76 (70) -0.55 (-14) -16.7%
Revolutions per mile (km) 978.36 (607.92) 1033.64 (642.27) 55.27 (34.35) 5.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.93 mph (30.47 km/h)
25 mph (40.23 km/h)23.66 mph (38.08 km/h)
30 mph (48.28 km/h)28.4 mph (45.7 km/h)
35 mph (56.33 km/h)33.13 mph (53.32 km/h)
40 mph (64.37 km/h)37.86 mph (60.93 km/h)
45 mph (72.42 km/h)42.59 mph (68.55 km/h)
50 mph (80.47 km/h)47.33 mph (76.16 km/h)
55 mph (88.51 km/h)52.06 mph (83.78 km/h)
60 mph (96.56 km/h)56.79 mph (91.4 km/h)
65 mph (104.61 km/h)61.52 mph (99.01 km/h)
70 mph (112.65 km/h)66.26 mph (106.63 km/h)
75 mph (120.7 km/h)70.99 mph (114.25 km/h)
80 mph (128.75 km/h)75.72 mph (121.86 km/h)
85 mph (136.79 km/h)80.45 mph (129.48 km/h)
90 mph (144.84 km/h)85.19 mph (137.1 km/h)
95 mph (152.89 km/h)89.92 mph (144.71 km/h)
100 mph (160.93 km/h)94.65 mph (152.33 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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