What Does ZR Mean on Tyres? Speed Rating Guide

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 by Chesca D
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Chesca D is a Content & Editorial Coordinator at Tyres.co.uk and is responsible for researching, coordinating, and producing accurate, up-to-date tyre guidance for our Knowledge Hub..
Each article is created using manufacturer specifications, recognised industry standards, and current UK regulations, and is reviewed internally to ensure clarity and technical accuracy. Content is updated regularly to reflect changes in tyre laws, safety guidance, and product specifications.
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The ‘ZR’ marking on tyres dates back to high-performance cars before the 1990s, but many drivers still come across it in older manuals and classic vehicles. This guide breaks down what ZR actually means, how it relates to maximum tyre speed, and which modern codes have replaced it. Whether you drive a performance car or simply want to understand tyre ratings, here’s how to interpret these important safety markings.

While most of our articles contain up to date information for new vehicles manufactured in the 21st century, the term ZR is actually something that harks back to performance and race cars pre-1990.

ZR is most likely something that is now seen in older vehicle handbooks and reference documents, as well as on historical wheels in displays and exhibitions.

It essentially means that the tyre has been manufactured to be driven at speeds over 150mph (240kmph).

The Replacement Code for ZR

Nowadays, a new code has replaced the ZR print on the tyre sidewall.

This new code follows the below format:

  • V is used to indicate tyres that can be driven up to 149mph (240kmph)
  • W indicates tyres can be driven up to 168mph (270kmph)
  • Y indicates a tyre that is designed to be driven up to 186mph (300kmph)

A single ‘R’ rating means that the tyre is designed to be driven at a maximum of 106mph.

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Why Speed Rating is So Important

Speed rating is what ensures that you do not push the tyres on your vehicle beyond what they are designed to sustain.

When vehicles drive at high speed, the rubber of the tyre suffers significant heating and wear, with the high stress causing tyre tread to become worn down and subject to damage much more readily.

Vehicles with the aforementioned codes tend to be designed for high performance and high speed driving. Of course, speeds of up to or even above 150mph are, more often than not, illegal – meaning that your chance to exceed the tyre speed rating is low anyway. 

If you need advice or specific guidance with regards to tyre speed rating for your vehicle, the team at Tyres.co.uk will be happy to help. With an unrivalled selection of tyres available, boasting different brands and finishes depending on the season and type of tyre required, there is nowhere with a better range of tyres to choose from.

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