Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
255/55r18 vs 255/35r18 Tire Comparison Side By Side
  255/55-18 255/35-18 Difference
Diameter inches (mm) 29.04 (737.7) 25.03 (635.7) -4.02 (-102) -13.8%
Width inches (mm) 10.04 (255) 10.04 (255) 0 (0) 0%
Circum. inches (mm) 91.24 (2317.55) 78.63 (1997.11) -12.62 (-320.44) -13.8%
Sidewall Height inches (mm) 5.52 (140.25) 3.51 (89.25) -2.01 (-51) -36.4%
Revolutions per mile (km) 694.42 (431.49) 805.84 (500.72) 111.42 (69.23) 16%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)17.23 mph (27.74 km/h)
25 mph (40.23 km/h)21.54 mph (34.67 km/h)
30 mph (48.28 km/h)25.85 mph (41.6 km/h)
35 mph (56.33 km/h)30.16 mph (48.54 km/h)
40 mph (64.37 km/h)34.47 mph (55.47 km/h)
45 mph (72.42 km/h)38.78 mph (62.41 km/h)
50 mph (80.47 km/h)43.09 mph (69.34 km/h)
55 mph (88.51 km/h)47.4 mph (76.28 km/h)
60 mph (96.56 km/h)51.7 mph (83.21 km/h)
65 mph (104.61 km/h)56.01 mph (90.14 km/h)
70 mph (112.65 km/h)60.32 mph (97.08 km/h)
75 mph (120.7 km/h)64.63 mph (104.01 km/h)
80 mph (128.75 km/h)68.94 mph (110.95 km/h)
85 mph (136.79 km/h)73.25 mph (117.88 km/h)
90 mph (144.84 km/h)77.56 mph (124.81 km/h)
95 mph (152.89 km/h)81.86 mph (131.75 km/h)
100 mph (160.93 km/h)86.17 mph (138.68 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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