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Shop for Tyres Tyres & Tyre Size Guide

Shop for Tyres

Our tyre range covers every popular size and application. Simply search our catalogue & buy online! If you can't find what you need, or for any assistance what-so-ever, please do call the Big Tyres Team on 01159 940 900, live chat or message us!

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Shop by Application

Click the icons above to find products & information specific to your vehicle type. Please always ensure you check & are happy with your chosen tyres pattern, construction, load rating & overall suitability for your machine. If you need assistance in finding the perfect tyres for your vehicle then please do contact us.

Shop by Brand

If you know the tyre brand you need then please select it above to view the products that we have listed. We can access most tyre brands on the market, so if you can't see the brand or tyre you are after please do let us know & we will try to source them for you. In many cases we can still get them to you next day.

Reading Your Tyre Size

A tyre size contains the most important information about your tyre. This will almost always include the tyre's Width (Section Width) and the tyres Rim Diameter. The tyre's Height (Outer Diameter) is sometimes included, otherwise the tyre's Profile (Series) might be given so that the tyre height can then be calculated. The size marking on the tyre also indicates the tyre's Construction, whether it be Radial or Crossply. Reading these values will help you search for your tyres.

Visual Examples

Tyre Sizes Explained

Understanding Your Tyre Specs

As well as the tyre size there are other things to consider when choosing a tyre, such as how much weight it can safely carry, the maximum speed it can travel at, if the tyre requires an inner tube and whether the tyre tread pattern is suitable for the ground it is being used on.

Pattern

Construction

Load and Speed Rating

Load/Speed Index Tables

Tyre Size Conversion Table

Technical Terms Explained

Width (Section Width)

This is how wide the tyre is if you were looking at the tyres tread face on. The number given in your tyre size is not the exact width of your tyre, but more the standard width a tyre should be according to the European Tyre & Rim Technical Organisation (E.T.R.T.O) for that tyre size. In general it can used a good guide to roughly how wide your tyre will be when inflated properly. The actual exact width of your tyre will vary with each Brand, and will be specified by each manufacturer in their tyres technical specification books, and even then individual tyres of the same brand might vary by an additional 2% from a manufacturer's specification.

Rim Diameter

This is the diameter of the rim that the tyre will fit (the diameter of the hole in the centre of the tyre). It is sometimes referred to as the Rim or the Rim Size, and it is given in almost every single tyre size as the last number after the "R" or "-" . The rims diameter is given in inches in 99% of tyre sizes. For some solid tyres/press-on-bands and some other rare occasions it is stated in mm not inches.

Rim Width

This is the width of the actual wheel rim that the tyre will fit. It is different to the tyres width (section width) as normally tyres are slightly wider than the metal wheel rim they fit on. Pneumatic tyres will have a recommended rim size, as well as alternative rims that the tyre will fit. Tyre manufacturers often tell you this information in their tyres technical spec data sheets. Solid tyres will fit only one rim width: this width will normally be given as a separate number after the tyre size. On some older crossply tyres this may be given after the section width in place of the profile.

Height (Outer Diameter)

This is the overall height of the tyre. This information is normally only given on turf, ATV, UTV and flotation tyres as the first number in the size, followed by an "X". It is usually written in Inches. For some small tyres this number is given in millimetres, normally followed by the tyre width in millimetres and then with the tyre rim size omitted.

Profile (Series)

The profile, sometimes known as the series, is the height of the tyres sidewall given as a percentage of the tyres width. This is normally only given on radial tyres, and is preceeded by a "/". To find the height of a tyre with a profile: Height(mm) = ((Profile / 100) * Width(mm) * 2) + (Rim(in) * 25.4).

Construction

Construction refers to whether a tyre is manufactured with either a Radial, Crossply or Solid construction. Each have their own benefits and drawbacks. Refer to these terms below.

Crossply

Crossply is the older pneumatic construction method, which creates a quite rigid tyre with stiff sidewalls. If a tyre is crossply it will be specified in the tyre size marking as a "-" before the rim size (as long as the tyre is not solid). Crossply tyres can be good in construction and forestry applications as the stiff sidewalls help prevent punctures in the tyre sidewalls.

Radial

Radial is the newer construction method used for almost all road-going tyres. This will be specified by an "R" before the rim size. Radial tyres are more expensive than crossply tyres normally, but they are more flexible, giving a more comfortable ride, and handle heat better so are more efficient at high speeds and the tyre tread will not wear down as fast as a crossply tyre might. The tread area is more flexible than a crossply tyre so it can flex over objects better helping it avoid punctures to the tread area.

Solid

Solid tyres have no air and so cannot be punctured. They are normally used on slow machines which operate only on hard, flat ground, such as forklift trucks. A solid tyre will normally say Solid on the tyre sidewall, but other indications are the lack of any air valve on the wheel rim as air is not required. Solid tyres wear well due to the amount of rubber on them, and the puncture resistance is vital in some applications like scrap metal recycling yards. They don't however offer much cushioning compared to pneumatic tyres so the ride can be stiff and machinery is put under more stress.

Rolling Circumference

This is the ground distance covered by the tyre in one full rotation. To avoid damaging four-wheel-drive (4WD) machines the ratio of front rolling circumference to rear rolling circumference must be maintained to within a small tolerance, and is why the front and rear tyre sizes on 4WD machines cannot be changed without considerable thought.