Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
125/80r15 vs 150/50r15 Tire Comparison Side By Side
  125/80-15 150/50-15 Difference
Diameter inches (mm) 22.87 (581) 20.91 (531) -1.97 (-50) -8.6%
Width inches (mm) 4.92 (125) 5.91 (150) 0.98 (25) 20%
Circum. inches (mm) 71.86 (1825.27) 65.68 (1668.19) -6.18 (-157.08) -8.6%
Sidewall Height inches (mm) 3.94 (100) 2.95 (75) -0.98 (-25) -25%
Revolutions per mile (km) 881.7 (547.86) 964.73 (599.45) 83.02 (51.59) 9.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.28 mph (29.42 km/h)
25 mph (40.23 km/h)22.85 mph (36.77 km/h)
30 mph (48.28 km/h)27.42 mph (44.13 km/h)
35 mph (56.33 km/h)31.99 mph (51.48 km/h)
40 mph (64.37 km/h)36.56 mph (58.83 km/h)
45 mph (72.42 km/h)41.13 mph (66.19 km/h)
50 mph (80.47 km/h)45.7 mph (73.54 km/h)
55 mph (88.51 km/h)50.27 mph (80.9 km/h)
60 mph (96.56 km/h)54.84 mph (88.25 km/h)
65 mph (104.61 km/h)59.41 mph (95.61 km/h)
70 mph (112.65 km/h)63.98 mph (102.96 km/h)
75 mph (120.7 km/h)68.55 mph (110.31 km/h)
80 mph (128.75 km/h)73.12 mph (117.67 km/h)
85 mph (136.79 km/h)77.69 mph (125.02 km/h)
90 mph (144.84 km/h)82.25 mph (132.38 km/h)
95 mph (152.89 km/h)86.82 mph (139.73 km/h)
100 mph (160.93 km/h)91.39 mph (147.08 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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