Buy 285/55 R18 Tyres

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285/55 R18 Measurements

285/55 R18 is a tyre size commonly fitted to large SUVs and 4x4s where ground clearance is needed. The numbers are pretty straightforward. 285 is the tyre width in millimetres. 55 is the aspect ratio of the tyre, meaning the height of the sidewall is 55% of 285mm. R18 indicates a radial tyre fitted to an 18-inch rim, which gives an overall diameter of 771mm. The sidewall height of 157mm fills in the gap, which helps cushion the tyre from rougher road conditions. We sell 285/55 R18 tyres at Tyres.co.uk, including the XL variants.

Part of the sizeValueWhat it means
Section width 285 The width of the tyre across the tread, measured in millimetres.
Profile (aspect ratio) 55 Sidewall height as a percentage of the width - here, 55% of 285 mm (about 157 mm).
Construction R Radial construction, which is what nearly all road tyres use.
Rim diameter 18 The wheel diameter the tyre fits, measured in inches.
Your tyre dimensions
MeasurementValue
Sidewall height 156.8 mm (6.17 in)
Overall diameter 771 mm (30.3 in)
Circumference 2,421 mm (95.3 in)
Revolutions 665 per mile · 413 per km
Equivalent sizes
SizeOverall diameter
265/55 R19 774 mm · +0.4%
265/60 R18 775 mm · +0.6%
265/65 R17 776 mm · +0.7%
275/50 R19 758 mm · -1.7%
275/55 R19 785 mm · +1.9%
275/60 R18 787 mm · +2.1%