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 150/80r14 Tire Comparison Side By Side
  180/80-14 150/80-14 Difference
Diameter inches (mm) 25.34 (643.6) 23.45 (595.6) -1.89 (-48) -7.5%
Width inches (mm) 7.09 (180) 5.91 (150) -1.18 (-30) -16.7%
Circum. inches (mm) 79.6 (2021.93) 73.67 (1871.13) -5.94 (-150.8) -7.5%
Sidewall Height inches (mm) 5.67 (144) 4.72 (120) -0.94 (-24) -16.7%
Revolutions per mile (km) 795.94 (494.58) 860.09 (534.43) 64.15 (39.86) 8.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.51 mph (29.79 km/h)
25 mph (40.23 km/h)23.14 mph (37.23 km/h)
30 mph (48.28 km/h)27.76 mph (44.68 km/h)
35 mph (56.33 km/h)32.39 mph (52.13 km/h)
40 mph (64.37 km/h)37.02 mph (59.57 km/h)
45 mph (72.42 km/h)41.64 mph (67.02 km/h)
50 mph (80.47 km/h)46.27 mph (74.47 km/h)
55 mph (88.51 km/h)50.9 mph (81.91 km/h)
60 mph (96.56 km/h)55.53 mph (89.36 km/h)
65 mph (104.61 km/h)60.15 mph (96.81 km/h)
70 mph (112.65 km/h)64.78 mph (104.25 km/h)
75 mph (120.7 km/h)69.41 mph (111.7 km/h)
80 mph (128.75 km/h)74.03 mph (119.15 km/h)
85 mph (136.79 km/h)78.66 mph (126.59 km/h)
90 mph (144.84 km/h)83.29 mph (134.04 km/h)
95 mph (152.89 km/h)87.91 mph (141.49 km/h)
100 mph (160.93 km/h)92.54 mph (148.93 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
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