Buy 315/30 R18 Tyres

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315/30 R18 is a wide, low-profile performance tyre size designed for maximum rear-end grip and sharp steering response on 18-inch wheels. It is most often found on high-powered, rear-biased setups, including rear fitments for cars such as the Porsche 911 GT2 (996) and similar track-focused conversions. With a 315 mm tread width and a short 30 profile sidewall, correct load and speed ratings matter as much as the brand and compound. Compare leading UHP options on Tyres.co.uk and choose the best match for your driving style and fitment requirements.

Buying 315/30 R18 Tyres: FAQ

In most applications, yes - it is commonly used on the rear axle as part of a staggered setup to handle higher power and traction demands. Always confirm against your vehicle placard or handbook, as the correct front size, wheel width and offset must all match the manufacturer specification.

This size is usually paired with wide rims, with many tyre makers listing approximately 10.5 to 12.0 inches as an acceptable range depending on the model. Check the tyre manufacturer data sheet for the exact approved rim widths, and ensure there is enough clearance to suspension components and the wheel arch on full lock and full compression.

Match the exact load index and speed symbol specified by your vehicle manufacturer first, especially on performance cars where rear axle loads can be high. If you are choosing between options, prioritise the correct load index, then pick a speed rating that meets or exceeds the original specification for safe, legal use.

The market is dominated by ultra high performance summer tyres, as the size is aimed at sporty handling and warm-weather grip. All-season options can be limited, so if you drive year-round in the UK, consider whether a second winter wheel set is more practical, or filter by all-season availability and compare wet-grip ratings carefully.

Choose XL only if your vehicle specification calls for it or if the approved options for your car are XL, as it affects load capacity and sidewall construction. Run-flat variants in this size are less common than standard construction, so only select run-flat if your vehicle is designed for it and the tyre is clearly marked as run-flat.