Buy 245/45 R18 Tyres

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245/45 R18 Numbers Explained

245/45 R18 is fitted as original equipment to BMW 5 Series and Mercedes-Benz E-Class models. As for the numbers, 245 is the width of the tyre in millimetres. Aspect ratio 45 indicates the sidewall height is 45% of 245mm, making it approximately 110mm. R18 denotes that the tyre is radial and is fitted onto an 18-inch rim, making the total diameter 678mm. This sidewall height is suited for these cars as it is ideal for driving on the motorway. We have 245/45 R18 available on Tyres.co.uk, with runflat and XL versions.

Part of the sizeValueWhat it means
Section width 245 The width of the tyre across the tread, measured in millimetres.
Profile (aspect ratio) 45 Sidewall height as a percentage of the width - here, 45% of 245 mm (about 110 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 110.2 mm (4.34 in)
Overall diameter 678 mm (26.7 in)
Circumference 2,129 mm (83.8 in)
Revolutions 756 per mile · 470 per km
Equivalent sizes
SizeOverall diameter
245/40 R19 679 mm · +0.1%
225/55 R17 679 mm · +0.2%
225/50 R18 682 mm · +0.7%
235/40 R19 671 mm · -1.0%
225/45 R19 685 mm · +1.1%
265/40 R18 669 mm · -1.3%