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How much fuel the tyre uses as it rolls. Graded A to E, where A is the most efficient and E the least.
How well the tyre stops in the wet. Graded A to E, where A is the shortest stopping distance. Each grade is worth roughly 3 metres, about a car length.
How loud the tyre is from outside the car, measured in decibels. Graded A to C, where A is the quietest.
Designed for cars, rather than vans, 4x4s or commercial vehicles.
A stronger sidewall lets this tyre carry more weight than a standard tyre of the same size. Marked XL on the sidewall.
Built to handle both summer and winter conditions, so the same tyres can stay on all year instead of being swapped twice.
Designed for temperatures below 7°C. Summer tyre rubber hardens in the cold and loses grip, while a winter compound stays soft and holds the road in cold, wet and snowy conditions.
285/40 R21 is an SUV tyre size that is specific to the front of the Porsche Cayenne. The numbers indicate that the tyre is 285 millimetres wide. The 40 is the sidewall height to width ratio as a percentage, so the 40% of 285mm is 114mm. R21 indicates a radial tyre that is mounted on a 21-inch wheel. This combination gives a diameter of 761mm. The 114mm sidewall height is suitable for the weight of the Cayenne, and the tyre is expected to be an XL (Extra Load). Tyres.co.uk sells 285/40 R21, and the XL version as well.
We take care of everything for you with our fully fitted prices:
You pay online for the tyres and the fitting, so when you come for your appointment, there are no extra charges for the tyre fitting.
The price shown for mail-order tyres covers the tyre only (including VAT). Once you’ve selected your tyres and proceed to the basket, a delivery fee will be added to your order. Please be aware that certain areas of the country may incur additional delivery charges and, in some cases, slightly longer delivery times.
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