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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.
255/40 R20 is the original equipment for the front tyres on the Porsche Panamera and the Mercedes S-Class. It's simple. 255 is the width of the tyre in millimetres. 40 is the aspect ratio. So, the sidewall height is 40 percent of 255 millimetres (102 millimetres). R means it is a radial tyre and 20 means the rim is 20 inches, so the overall diameter is 712mm. Tyres.co.uk stocks 255/40 R20 in XL and run-flat options.
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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