285/50 R18 Tyres

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285/50 R18 Explained

The original tyre size for the Mercedes-Benz ML 55 AMG is 285/50 R18. As for the size, 285 describes the width in millimetres. 50 describes the sidewall as 50% of the width, or 142mm. R18 specifies a radial tyre on an 18-inch rim, and the overall diameter is 742mm. AMG designed the ML 55 sidewall with rough roads in mind. Tyres.co.uk sells the standard and XL versions of 285/50 R18.

Part of the sizeValueWhat it means
Section width 285 The width of the tyre across the tread, measured in millimetres.
Profile (aspect ratio) 50 Sidewall height as a percentage of the width - here, 50% of 285 mm (about 142 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 142.5 mm (5.61 in)
Overall diameter 742 mm (29.2 in)
Circumference 2,332 mm (91.8 in)
Revolutions 690 per mile · 429 per km
Similar sizes
SizeOverall diameter
285/45 R19 739 mm · -0.4%
265/50 R19 748 mm · +0.7%
275/55 R17 734 mm · -1.1%
275/45 R19 730 mm · -1.6%
275/50 R19 758 mm · +2.1%
265/45 R19 721 mm · -2.8%

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