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295/30 R18 Explained

295/30 R18 is the tyre size of the rear wheels of the Porsche 911 Turbo and GT3 models. The first number is the width of the tyre in millimetres, the second number is the sidewall height as a percentage of the width, so in this case 30% of 295mm which is 88mm, and the last part, R 18, is the diameter of the wheels in inches. The overall diameter of the tyre is 634mm. This tyre has a very low sidewall which is good for rear fitment. We sell this size tyre, including the XL version, at Tyres.co.uk.

Part of the sizeValueWhat it means
Section width 295 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 295 mm (about 88 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 88.5 mm (3.48 in)
Overall diameter 634 mm (25.0 in)
Circumference 1,992 mm (78.4 in)
Revolutions 808 per mile · 502 per km
Equivalent sizes
SizeOverall diameter
285/30 R18 628 mm · -0.9%
315/30 R18 646 mm · +1.9%
275/30 R19 648 mm · +2.1%
275/35 R18 650 mm · +2.4%
275/40 R17 652 mm · +2.8%