Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
180/80r14 vs 130/90r10 Tire Comparison Side By Side
  180/80-14 130/90-10 Difference
Diameter inches (mm) 25.34 (643.6) 19.21 (488) -6.13 (-155.6) -24.2%
Width inches (mm) 7.09 (180) 5.12 (130) -1.97 (-50) -27.8%
Circum. inches (mm) 79.6 (2021.93) 60.36 (1533.1) -19.25 (-488.83) -24.2%
Sidewall Height inches (mm) 5.67 (144) 4.61 (117) -1.06 (-27) -18.8%
Revolutions per mile (km) 795.94 (494.58) 1049.73 (652.27) 253.79 (157.7) 31.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)15.16 mph (24.41 km/h)
25 mph (40.23 km/h)18.96 mph (30.51 km/h)
30 mph (48.28 km/h)22.75 mph (36.61 km/h)
35 mph (56.33 km/h)26.54 mph (42.71 km/h)
40 mph (64.37 km/h)30.33 mph (48.81 km/h)
45 mph (72.42 km/h)34.12 mph (54.91 km/h)
50 mph (80.47 km/h)37.91 mph (61.01 km/h)
55 mph (88.51 km/h)41.7 mph (67.11 km/h)
60 mph (96.56 km/h)45.49 mph (73.22 km/h)
65 mph (104.61 km/h)49.29 mph (79.32 km/h)
70 mph (112.65 km/h)53.08 mph (85.42 km/h)
75 mph (120.7 km/h)56.87 mph (91.52 km/h)
80 mph (128.75 km/h)60.66 mph (97.62 km/h)
85 mph (136.79 km/h)64.45 mph (103.72 km/h)
90 mph (144.84 km/h)68.24 mph (109.82 km/h)
95 mph (152.89 km/h)72.03 mph (115.93 km/h)
100 mph (160.93 km/h)75.82 mph (122.03 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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