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 120/80r14 Tire Comparison Side By Side
  140/60-14 120/80-14 Difference
Diameter inches (mm) 20.61 (523.6) 21.56 (547.6) 0.94 (24) 4.6%
Width inches (mm) 5.51 (140) 4.72 (120) -0.79 (-20) -14.3%
Circum. inches (mm) 64.76 (1644.94) 67.73 (1720.34) 2.97 (75.4) 4.6%
Sidewall Height inches (mm) 3.31 (84) 3.78 (96) 0.47 (12) 14.3%
Revolutions per mile (km) 978.36 (607.92) 935.48 (581.28) -42.88 (-26.64) -4.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.92 mph (33.66 km/h)
25 mph (40.23 km/h)26.15 mph (42.08 km/h)
30 mph (48.28 km/h)31.38 mph (50.49 km/h)
35 mph (56.33 km/h)36.6 mph (58.91 km/h)
40 mph (64.37 km/h)41.83 mph (67.32 km/h)
45 mph (72.42 km/h)47.06 mph (75.74 km/h)
50 mph (80.47 km/h)52.29 mph (84.16 km/h)
55 mph (88.51 km/h)57.52 mph (92.57 km/h)
60 mph (96.56 km/h)62.75 mph (100.99 km/h)
65 mph (104.61 km/h)67.98 mph (109.4 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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