It should be noted that, although T, H and V are all above 70 mph - the national driving limit in the UK - you still require an index that matches the car manufacturer’s specifications. This often means having tyres suitable for your car’s top speed, even if you are never planning to drive that fast. Tyre Size - The tyre size is easy to read, once you know how. Simply put, it is made up of a series of numbers. Let’s use 205/55 R16 as an example. The first value (in this example, 205) is the tyre width in millimeters. The second value (55) is the tyre profile in percentage. The third value (16) is the rim diameter in inches. The letter at the start of the third value refers to the type of tyre construction. R, for example, refers to radial tyres.

Michelin's patented Silica-based compounds and Progressive Slip Technology (PST) provides a very high level of grip on wet or slippery surfaces, including painted street stripes. The deeper grooves give it better water displacement on any wet road surface. They also added new water channeling groves for even better handling in wet conditions.

Swish UPVC Skirtings 95mm x 5M x 12mm thick Ogee

Once you’ve used the tyre size converter - of if you have some tyre sizes in mind - you may want to more accurately compare a specific range of tyre options. If you fit a tyre equivalent with a bigger diameter, this can cause the speedometer to misrepresent your actual velocity. This change depends on the change in tyre size. If you fit tyres with a larger diameter, the speedometer will show a figure lower than your actual speed. If you fit tyres with a smaller diameter, the speedometer will instead show a higher than realistic speed. Note the tyre diameter You should also always be aware that, after changing tyre size, various driving characteristics, such as the various fuel consumption and grip properties, well change as a result. These may be better or worse, depending on the options you have chosen. When it comes to choosing a new size, many drivers choose to stay within the same size and diameter - these tyres are known as equivalents. Alternatives, on the other hand, have a different size. They are typically larger - upgrading in this way is referred to as plus sizing. Proper fraction button and Improper fraction button work as pair. When you choose the one the other is switched off.

Our tyre diameter calculator is a great tool for finding a new tyre size, but you should keep in mind some physical limitations. Our tyre calculator does not, for instance, take into account your specific car or model. As such, always keep the physical needs and parameters of your vehicle in mind. Similarly, you couldn’t go up from a 185/80 R13 to a 225/40 R18 tyre due to a look of space in the wheel arch. Cars just aren’t designed to accommodate such great changes, which is why rules such as the 1.5% or -2% are regularly used. As we have already mentioned, there are pros and cons to consider, whether you choose a wider or narrower tyre.

Help and Tips

Aside from the acceptable tyre diameter difference, you should also consider the various indexes and factors that represent a tyre’s suitability. This is important when choosing new car tyres in your chosen size and ensuring they are within the accepted index limits. Not sure what some of the numbers on your tyre mean, or how to identify the various indexes? We’ve prepared a small dictionary of these terms for your benefit. This tyre size converter is designed for comparing new tyre sizes against the original size - the option recommended by the car’s manufacturer, as stated in its manual.

Choosing an alternative tyre size usually requires changing both the tyre and wheel diameter. If you fit a lower tyre diameter, the overall profile will automatically be lower than your previous tyres, unless you use a wider wheel to compensate (this, of course, would require a tyre with a matching internal diameter). Likewise, you need to be careful when changing the diameter of the tyre. You can’t replace a standard 225/40 R18 tyre, for instance, with a 185/80 R13 tyre, as the smaller model would require 13 inch wheels that can’t fit the braking discs from the larger 18 inch wheels. Thanks to MICHELIN's new Progressive Slip Technology (PST), MICHELIN City Grip helps prevent sliding on hazards such as wet roads and manhole covers.

Rectangle 15mm X 13mm x 5M White

It's the TWO that makes all the difference. The original City Grip is a great tire, but the City Grip TWO has added some nice extras. The new City Grip 2 is also heavier, giving it more stability at any speeds (this is nice when your tires are only 12" in diameter). Suitable for both Front and Rear tires. S rated for up to 112 mph.