Ultra-high-performance tyres are highly-complex, technologically-advanced automotive parts. 255/35 R19 tyres are designed to provide essential grip and security to some of the most impressive performance cars ever developed. The great tread width and low profile are adaptations to the extreme demands placed on the tyres of such vehicles.
The description begins with the number 255, the cross-section width indicator. Measured as the greatest distance from sidewall to sidewall, this is a little more than the width of the tread itself. Here, we have a cross-section width of 255 millimetres. Next, we use this value and the aspect ratio indication to determine cross-section height.
The aspect ratio in this case is 35, and it tells us that cross-section height (or sidewall height) is 35% of width (in this case, of 255 mm). We also have the letter R', informing us that this is a radial tyre, and the number 19 - meaning that 19 inch rims are needed for this size variant.
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