Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
255/50r15 vs 225/60r15 Tire Comparison Side By Side
  255/50-15 225/60-15 Difference
Diameter inches (mm) 25.04 (636) 25.63 (651) 0.59 (15) 2.4%
Width inches (mm) 10.04 (255) 8.86 (225) -1.18 (-30) -11.8%
Circum. inches (mm) 78.66 (1998.05) 80.52 (2045.18) 1.86 (47.12) 2.4%
Sidewall Height inches (mm) 5.02 (127.5) 5.31 (135) 0.3 (7.5) 5.9%
Revolutions per mile (km) 805.46 (500.49) 786.9 (488.95) -18.56 (-11.53) -2.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.47 mph (32.95 km/h)
25 mph (40.23 km/h)25.59 mph (41.18 km/h)
30 mph (48.28 km/h)30.71 mph (49.42 km/h)
35 mph (56.33 km/h)35.83 mph (57.66 km/h)
40 mph (64.37 km/h)40.94 mph (65.89 km/h)
45 mph (72.42 km/h)46.06 mph (74.13 km/h)
50 mph (80.47 km/h)51.18 mph (82.37 km/h)
55 mph (88.51 km/h)56.3 mph (90.6 km/h)
60 mph (96.56 km/h)61.42 mph (98.84 km/h)
65 mph (104.61 km/h)66.53 mph (107.07 km/h)
70 mph (112.65 km/h)71.65 mph (115.31 km/h)
75 mph (120.7 km/h)76.77 mph (123.55 km/h)
80 mph (128.75 km/h)81.89 mph (131.78 km/h)
85 mph (136.79 km/h)87 mph (140.02 km/h)
90 mph (144.84 km/h)92.12 mph (148.26 km/h)
95 mph (152.89 km/h)97.24 mph (156.49 km/h)
100 mph (160.93 km/h)102.36 mph (164.73 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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