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. 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. Load Index - Referred to as LI for short, this figure determines the maximum load that the tyre can handle when driving at the maximum speed (as determined by the aforementioned speed index).

Reinforced longer lasting than other tires brands and still retaining their traction. The deeper groves will also give it longer life. The tyre size calculator does not include information about car make and model. Please keep in mind your car's capabilities.. These are the reinforced 58S Rated, with a max payload rating of 520 pounds and top speed of 112 mph. As we have already mentioned, there are pros and cons to consider, whether you choose a wider or narrower tyre.

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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. 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. 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. 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).

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.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. 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 comparison tool is useful when you have some specific tyre sizes in mind. Select your original size and compare a number of alternative sizes that you are considering. We will show you which ones can be safely mounted in green, as well as highlighting unadvisable options in red. Your safest solution is to choose equivalent options with the same rim diameter. However, if you do wish to use a different rim size, our specialists are always available to help. The standard sizeAside 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. 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. 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. Speed Index - Known as SI for short, the speed index determines the maximum speed allowed for a given tyre. The tyre speed index is expressed with letters, each having a specific limit, such as: Proper fraction button is used to change a number of the form of 9/5 to the form of 1 4/5. A proper fraction is a fraction where the numerator (top number) is less than the denominator (bottom number).

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. 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 When using a tyre size comparison tool, it’s important to know the difference in the outer diameter. Our tool gives this in percentages: a positive number is larger/wider, while a minus number represents a negative change. Proper fraction button and Improper fraction button work as pair. When you choose the one the other is switched off. Thanks to MICHELIN's new Progressive Slip Technology (PST), MICHELIN City Grip helps prevent sliding on hazards such as wet roads and manhole covers.Our tyre size converter helps identify alternative sizes by using restricting diameter sizes to the specified 1.5 or -2% rules mentioned earlier. However, this will just show you all the theoretically possible sizes. This is clearly marked on the side your tyres. Just look up the assigned letter on our tyre speed rating.