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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.
255/45 R18 is a tyre size associated with executive cars and used on the Audi A8 and the Mercedes-Benz S-Class. The first number is the width of the tyre in mm so here the width is 255mm. The middle number is the sidewall height as a percentage of the width. Here, an aspect ratio of 45 means the sidewall height is 45% of 255mm, which is 115mm. The R means radial and 18 indicates the rim diameter in inches. Therefore, the sidewall height of 115mm in conjunction with the 18-inch rim results in a tyre diameter of 687mm. The A8 and S-Class can both benefit from greater sidewall height as it creates more absorption for bumps on the road. 255/45 R18 tyres are available on Tyres.co.uk.
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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