Welcome to Kwik Fit 
Your privacy is as important to us as your safety on the road
To provide you with the best online experience, Kwik Fit and our partners use technologies such as cookies to store local information on your device. Consenting to our recommended technologies allows us and our partners to process data such as your browsing behaviour or individual identifiers on this website.
Click the green button below to consent with our recommended settings or you may switch the performance and targeting categories on or off individually, then save your settings. You can freely update your choices at any time and view the full list of cookies that may be placed by clicking the Cookies link in the footer of every page of our website.
Still Unsure? Book A Free Tyre Check
Confused by load indexes and speed ratings? Not sure if you require runflats or reinforced tyres? Don’t worry, why not book a free tyre check and our technicians will inspect your tyres for you and provide advice on the most suitable tyres for your vehicle.
Finding Your Tyre Size
Tyre Size
Your tyre size can be found on the sidewall of your current tyre and is a sequence of numbers and letters. The most common tyre size in the UK is 205/55R16 but there are many variations so its important to check your existing tyre first before searching for tyres.
Tip: Take a photo of your existing tyre sidewall to make it easier to identify your tyre size using the guide below.
Tyre Width
The first three digits. This displays the width of the tyre in millimetres. A tyre marked 225 will measure 225mm across the tread from sidewall to sidewall.
Aspect Ratio
The fourth and fifth digits of the tyre code that immediately follow the tyre width. The aspect ratio or profile height of the tyre sidewall is expressed as a percentage of the tyre width. So an aspect ratio of 55 for example means that the profile height of the tyre is 55% of its width.
Rim Diameter
The next two digits represent the size of the wheel rim that the tyre can be fitted to. It is also the diameter of the tyre from bead to bead. So a tyre marked 16 will fit on a 16-inch wheel rim.
Speed Rating
The speed rating of a tyre is represented by a letter of the alphabet at the end of the tyre size code and indicates the maximum speed capability of the tyre. Tyres receive a speed rating based on a series of tests which measure the tyres capability to handle a set speed for a prolonged period of time.
Select your tyre speed rating to find out the maximum speed your tyres can maintain.
If you are unsure what speed rating you need, be sure to check your vehicle handbook. Choosing a lower speed rating than that recommended by your vehicle manufacturer could potentially invalidate your insurance.