Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
225/65r17 vs 265/60r18 Tire Comparison Side By Side
  225/65-17 265/60-18 Difference
Diameter inches (mm) 28.52 (724.3) 30.52 (775.2) 2 (50.9) 7%
Width inches (mm) 8.86 (225) 10.43 (265) 1.57 (40) 17.8%
Circum. inches (mm) 89.58 (2275.46) 95.88 (2435.36) 6.3 (159.91) 7%
Sidewall Height inches (mm) 5.76 (146.25) 6.26 (159) 0.5 (12.75) 8.7%
Revolutions per mile (km) 707.26 (439.47) 660.82 (410.62) -46.44 (-28.86) -6.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.41 mph (34.45 km/h)
25 mph (40.23 km/h)26.76 mph (43.06 km/h)
30 mph (48.28 km/h)32.11 mph (51.67 km/h)
35 mph (56.33 km/h)37.46 mph (60.29 km/h)
40 mph (64.37 km/h)42.81 mph (68.9 km/h)
45 mph (72.42 km/h)48.16 mph (77.51 km/h)
50 mph (80.47 km/h)53.51 mph (86.12 km/h)
55 mph (88.51 km/h)58.87 mph (94.73 km/h)
60 mph (96.56 km/h)64.22 mph (103.35 km/h)
65 mph (104.61 km/h)69.57 mph (111.96 km/h)
70 mph (112.65 km/h)74.92 mph (120.57 km/h)
75 mph (120.7 km/h)80.27 mph (129.18 km/h)
80 mph (128.75 km/h)85.62 mph (137.8 km/h)
85 mph (136.79 km/h)90.97 mph (146.41 km/h)
90 mph (144.84 km/h)96.32 mph (155.02 km/h)
95 mph (152.89 km/h)101.68 mph (163.63 km/h)
100 mph (160.93 km/h)107.03 mph (172.24 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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