Here we present all the steps to choose a correct tyre suitable for your car or your motorcycle.
In this guide we will show you step by step, how to choose the right tyre, without making mistakes, saving and having excellent service.
THE FIRST THING TO DO: CHECK THE BOOKLET (CIRCULATION CARD)
The booklet is our reference from which we must take all the necessary information in order not to err tyre. Let us remember that mounting an incorrect size could create problems when reviewing or checking law enforcement. Choosing a product with the correct size is very simple and requires no special skills.
Example of a vehicle registration document
In older booklets or current booklets, the consultation method is always the same. In fact, we will find one or more sizes available for our car or motorcycle. The measurement is expressed in 6 values.
Let’s examine for example a very common measure:
205 50 R17 94 V
- The width (205) expressed in millimeters
- Shoulder height (50) expressed as a percentage of the width
- The construction (R) means that the tyre is radial
- The diameter of the circle (17) value expressed in inches
- The load index (94) expressed to represent a value referring to the kilograms of weight supported by the tyre, attention however 88 does not mean 88 Kg but 670 Kg. There is a reference table.
- The speed code (V) expressed in the maximum speed approved for the tyre, also, in this case, there is a reference table.
Note: if the booklet shows more alternatives in terms of measurements, it is not certain that they are all compatible with the rims mounted: it is always essential to check the dimensions of the rim mounted on the car:
The choice of load index is very trivial. Just choose a code equal to or greater than the one shown in the booklet.
Just choose an equal
or higher number. For example, if we have on book 88 we will choose 88,
89, 90, 91, etc.
If, for example, we have a booklet of 94 we will choose 94, 95, 96, 97, etc …
The choice of the speed code must be made carefully. If the registration document indicates a V code (240 km / h) it will be mandatory to fit Car tyres with code V or higher (W, Y or ZR) even if the car can only reach 200 kilometers per hour.
Attention: the speed codes are not sorted in alphabetical order as you might think
Note: tyres with a GREATER speed code than the one indicated in the booklet can always be installed in a car.
M: 130 km / h
N: 140 km / h
P: 150 km / h
Q: 160 km / h
R: 170 km / h
S: 180 km / h
T: 190 km / h
U: 200 km / h
H: 210 km / h
V: 240 km / h
W: 270 km / h
Y: 300 km / h
ZR:> 240 km / h – The ZR annotation contains speed indexes V: 240 km / h, W: 270 km / h Y: 300 km / h Please
note for MOTORCYCLES: In motorcycle booklets, the load index and speed code are often contained within two brackets. When choosing tyres it is essential to respect the presence or absence of brackets. Ex: (79S)
THE SECOND THING TO DO: CHECK THE ASSEMBLED MEASUREMENT
As seen above and as illustrated in the example booklet, it is possible that on the booklet there are reported different sizes also suitable for different circle diameters. When we go to buy the car, we can often choose whether to have a circle of different sizes, for example 16 inches, 17 inches, 18 inches, etc.
For this motif in booklet we find different sizes, so you can buy the correct tyre regardless of the rim size that we have mounted on the car.
Always taking the measure as an example
205 50 R17 94 V
Let’s check on the car to have mounted the circle just from 17, the number just present after the R