Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
255/50r18 vs 265/60r18 Tire Comparison Side By Side
  255/50-18 265/60-18 Difference
Diameter inches (mm) 28.04 (712.2) 30.52 (775.2) 2.48 (63) 8.8%
Width inches (mm) 10.04 (255) 10.43 (265) 0.39 (10) 3.9%
Circum. inches (mm) 88.09 (2237.44) 95.88 (2435.36) 7.79 (197.92) 8.8%
Sidewall Height inches (mm) 5.02 (127.5) 6.26 (159) 1.24 (31.5) 24.7%
Revolutions per mile (km) 719.28 (446.94) 660.82 (410.62) -58.46 (-36.32) -8.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.77 mph (35.03 km/h)
25 mph (40.23 km/h)27.21 mph (43.79 km/h)
30 mph (48.28 km/h)32.65 mph (52.55 km/h)
35 mph (56.33 km/h)38.1 mph (61.31 km/h)
40 mph (64.37 km/h)43.54 mph (70.07 km/h)
45 mph (72.42 km/h)48.98 mph (78.83 km/h)
50 mph (80.47 km/h)54.42 mph (87.59 km/h)
55 mph (88.51 km/h)59.87 mph (96.34 km/h)
60 mph (96.56 km/h)65.31 mph (105.1 km/h)
65 mph (104.61 km/h)70.75 mph (113.86 km/h)
70 mph (112.65 km/h)76.19 mph (122.62 km/h)
75 mph (120.7 km/h)81.63 mph (131.38 km/h)
80 mph (128.75 km/h)87.08 mph (140.14 km/h)
85 mph (136.79 km/h)92.52 mph (148.9 km/h)
90 mph (144.84 km/h)97.96 mph (157.65 km/h)
95 mph (152.89 km/h)103.4 mph (166.41 km/h)
100 mph (160.93 km/h)108.85 mph (175.17 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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