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The tyres on your car might seem like simple rubber circles, mass produced in a moulding machine with no distinguishable characteristics other than a tread pattern, but in reality they are carefully constructed using a series of different processes and up to 200 raw materials.
Tread design incorporates grooves to remove water between the tyre and the road surface
Zero degree belt found on top of bracing plies in some tyres helps the tyre to maintain its shape at high speeds by resisting centrifugal growth.
Bracing plies made from a series of polyester cords, reinforced with steel and encased in rubber make the tread surface flatter increasing the contact patch with the road
Radial casing plies contain textile fibre cords that give the tyre strength and enable the tyre to resist pressure.
Inner liner made of a synthetic rubber design to keep air in the tyre. Think of it as a kind of inner tube.
Bead protector rubber rim strips protect the bead from minor shocks
Steel bead wires hold the tyre onto the wheel rim. They can bear a load of up to 1800kg.
Sidewall rubber is constructed from an abrasion-resistant compound providing protection against scuffs and curb damage.
Each tyre model is different and tyre manufacturers invest heavily in research and development to create the best tyres for different driving conditions. When designing a new tyre, one of the key components is the mixture of rubber compounds used in the tyre which is balanced to optimise steering, braking, road handling and wear capabilities. Other key components of a tyre include the steel bead wires which hold the tyre on the rim of the wheel, the casing ply that gives the tyre strength, and the bracing plies which maximise the tyre’s contact patch with the road.
On the outside of the tyre, grooves and tread sipes on the shoulder of the tyre are specially designed to channel water away from the surface of the tyre, maintaining maximum wet grip. The contact patch is also designed to resist general wear and tear and cope with high temperatures generated by friction.
Remember, your tyres are the only contact between your car and the road so it’s essential that they provide sufficient grip and road handling. Your tyres are also designed to deliver a comfortable ride, yet be as robust and hard-wearing as possible, maintaining safe and controlled manoeuvrability for your vehicle.
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 it’s 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.
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.
Load Rating
The load index provides information on the maximum weight capability for the tyre. The load index is a numerical code that can be located just after the tyre size marking and before the speed rating.
Select your load index to find out the maximum load capability for your tyres.
Although not illegal, it is not advisable to have tyres with a lower speed rating or load index than the manufacturer recommended tyre specification for your vehicle, or to have a combination of different tyre construction types. Consult your vehicle handbook to confirm your vehicle’s tyre speed rating and load index as well as any additional requirements.
0800 75 76 77 You can reach our customer care team 6 days a week from 9:00am to 6:00pm on Monday and Thursday, 8:30am to 6:00pm Tuesday, Wednesday and Friday, 8:30am to 5:00pm Saturday, and 10:00am to 4:00pm on Bank Holidays.
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Select Tyre Size
Front Tyre Size
Rear Tyre Size
We endeavour to ensure we are displaying the correct tyres for your vehicle. However, we recommend all customers check the tyre size printed on the side wall of their tyres before proceeding with a tyre purchase as occasionally discrepancies do occur. By selecting the tyre sizes above and clicking 'Continue', you are indicating that you have checked your tyre sizes.
Please select your front and rear tyre size before clicking 'Continue'.
We have identified the tyre size(s) that may fit your {VEHICLE}. Please select your front tyre size and rear tyre size below before clicking 'Continue'.
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Please note: There is a slope that the vehicle must be driven up to reach the vehicle ramp at this centre. This may prevent us from being able to work on some high-performance vehicles, Tesla vehicles or vehicles that have been lowered. If your vehicle has low ground clearance, please contact the centre team on 01342 314 111 before booking.
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Centres do not open until 10:00 on bank holidays. If choosing an earlier appointment time on a bank holiday, please bring your vehicle to centre at 10:00 rather than the time shown.
