Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
150/70r13 vs 150/50r13 Tire Comparison Side By Side
  150/70-13 150/50-13 Difference
Diameter inches (mm) 21.27 (540.2) 18.91 (480.2) -2.36 (-60) -11.1%
Width inches (mm) 5.91 (150) 5.91 (150) 0 (0) 0%
Circum. inches (mm) 66.81 (1697.09) 59.39 (1508.59) -7.42 (-188.5) -11.1%
Sidewall Height inches (mm) 4.13 (105) 2.95 (75) -1.18 (-30) -28.6%
Revolutions per mile (km) 948.3 (589.24) 1066.78 (662.87) 118.49 (73.62) 12.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)17.78 mph (28.61 km/h)
25 mph (40.23 km/h)22.22 mph (35.76 km/h)
30 mph (48.28 km/h)26.67 mph (42.92 km/h)
35 mph (56.33 km/h)31.11 mph (50.07 km/h)
40 mph (64.37 km/h)35.56 mph (57.22 km/h)
45 mph (72.42 km/h)40 mph (64.38 km/h)
50 mph (80.47 km/h)44.45 mph (71.53 km/h)
55 mph (88.51 km/h)48.89 mph (78.68 km/h)
60 mph (96.56 km/h)53.34 mph (85.84 km/h)
65 mph (104.61 km/h)57.78 mph (92.99 km/h)
70 mph (112.65 km/h)62.23 mph (100.14 km/h)
75 mph (120.7 km/h)66.67 mph (107.29 km/h)
80 mph (128.75 km/h)71.11 mph (114.45 km/h)
85 mph (136.79 km/h)75.56 mph (121.6 km/h)
90 mph (144.84 km/h)80 mph (128.75 km/h)
95 mph (152.89 km/h)84.45 mph (135.91 km/h)
100 mph (160.93 km/h)88.89 mph (143.06 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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