Buy 315/30 R18 Tyres

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315/30 R18 Size Guide

The 315/30 R18 rear tyre size is an ultra-wide rear tyre used on high-performance vehicles including the Porsche 996 GT2. The numbers denote the width in mm, the distance from the wheel to the outer edge of the tyre (sidewall) as a percentage, and the diameter of the rim in inches respectively. The low profile of the rear tyre aids acceleration of the GT2. Tyres.co.uk stocks 315/30 R18 including the extra load (XL) versions.

Part of the sizeValueWhat it means
Section width 315 The width of the tyre across the tread, measured in millimetres.
Profile (aspect ratio) 30 Sidewall height as a percentage of the width - here, 30% of 315 mm (about 94 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 94.5 mm (3.72 in)
Overall diameter 646 mm (25.4 in)
Circumference 2,030 mm (79.9 in)
Revolutions 793 per mile · 493 per km
Equivalent sizes
SizeOverall diameter
295/30 R18 634 mm · -1.9%
295/30 R19 660 mm · +2.1%
295/35 R18 664 mm · +2.7%