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As we have already mentioned, there are pros and cons to consider, whether you choose a wider or narrower tyre. Proper fraction button and Improper fraction button work as pair. When you choose the one the other is switched off. 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.

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: 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 size 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. 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). 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.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. 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. 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. 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.

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.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. Reinforced longer lasting than other tires brands and still retaining their traction. The deeper groves will also give it longer life.