Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
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130/70r13 vs 120/70r14 Tire Comparison Side By Side
  130/70-13 120/70-14 Difference
Diameter inches (mm) 20.17 (512.2) 20.61 (523.6) 0.45 (11.4) 2.2%
Width inches (mm) 5.12 (130) 4.72 (120) -0.39 (-10) -7.7%
Circum. inches (mm) 63.35 (1609.12) 64.76 (1644.94) 1.41 (35.81) 2.2%
Sidewall Height inches (mm) 3.58 (91) 3.31 (84) -0.28 (-7) -7.7%
Revolutions per mile (km) 1000.14 (621.46) 978.36 (607.92) -21.78 (-13.53) -2.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.45 mph (32.9 km/h)
25 mph (40.23 km/h)25.56 mph (41.13 km/h)
30 mph (48.28 km/h)30.67 mph (49.35 km/h)
35 mph (56.33 km/h)35.78 mph (57.58 km/h)
40 mph (64.37 km/h)40.89 mph (65.81 km/h)
45 mph (72.42 km/h)46 mph (74.03 km/h)
50 mph (80.47 km/h)51.11 mph (82.26 km/h)
55 mph (88.51 km/h)56.22 mph (90.48 km/h)
60 mph (96.56 km/h)61.34 mph (98.71 km/h)
65 mph (104.61 km/h)66.45 mph (106.94 km/h)
70 mph (112.65 km/h)71.56 mph (115.16 km/h)
75 mph (120.7 km/h)76.67 mph (123.39 km/h)
80 mph (128.75 km/h)81.78 mph (131.61 km/h)
85 mph (136.79 km/h)86.89 mph (139.84 km/h)
90 mph (144.84 km/h)92 mph (148.06 km/h)
95 mph (152.89 km/h)97.11 mph (156.29 km/h)
100 mph (160.93 km/h)102.23 mph (164.52 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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