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How to choose the size of car tyres ?

Tyre size

The driver can easily determine the appropriate size tyres for his car. When You look at the tyres that are already mounted - on their side should be the type designation i.e. 195/65R15 91T indicating the size. If the car has been purchased in the car shop, it has a tyre in the good size certainly. 

What characterizes the system Eurometric?

The Eurometric system means a standard well known all over the world. The convention written in special way may follow like this example: 195/65 R15 91Twhere:

  • - 195 is the width of the tyre in millimetres.
  • - 65 is the aspect ratio or tyre profile.
  • - R means it is radial construction.
  • - 15 is the diameter of the wheel rim in inches.

Tyre’s profile relates to the depth of the sidewall (the wall at the side of the tyre). The profile is expressed as a percentage of the tyre's width. Eg. Our 195/65R15 tyre has a profile or sidewall that is 65% of the 195mm (width). A low profile tyre is generally 50% or below, down to as little as 30% with ultra low profile tyres. Higher performance vehicles are usually fitted with tyres that have lower profiles. If Eurometric tyre is marked at the end of the letter "C", it means that it is a commercial vehicle tyre (from the English commercial), its size has the following record: 195/65R15C.

How to choose the size of the tyre and rim to the vehicle ?

The main advantages of the metric system to be assigned in advance index capacity up. Manufacturer, choosing the size of the tyres on the stage of designing a new car , it is assumed permissible load of the vehicle and on the basis of selected load index. The specified index can appear in different diameter tyre on the rear, different width and height profile. Of course, necessary to take into account the limitations inherent in the design of the vehicle and its characteristics. The manufacturer is therefore obliged to choose the most appropriate dimensions of the structure.

When selecting the size of the wheels of the vehicle are the most important:

  • - Tyre section width
  • - The width and rim diameter
  • - The outer diameter of the tyre

While driving, the tyre and rim can not collide with parts of the body, suspension or brake system. Required is enough space in the wheel well . Rim cannot have contact with the brake discs or suspension components. When selecting the size of the wheels and the vehicle should be guided by the following principles:

  • - load index and the outer diameter must be consistent
  • - tyre cannot be too narrow, would have a negative impact on the level of adhesion
  • - tyre cannot be too wide, would have a negative impact on vehicle dynamics
  • - mismatched outer diameter is associated with the distortions of indications odometer and speedometer . 

Remember that when choosing the size of the tyres follow the manufacturer's instructions. Observe index of speed, capacity , and outer diameter. Watch out also for the width - can not be too large nor too small. Improperly selected size can lead to a deterioration in driveability and comfort. It may also adversely affect the wear and tear of the car. To determine the right tyre size, you can also find this information in the book of the car. It should be in a chapter devoted to the technical specifications of the vehicle.

Another way to find out what size tyre is suitable for the car is to check the mark on the fuel filler flap. Sometimes, this information may also be on the threshold of the driver's door on the pillar behind the wheel or the lock mechanism of the driver. With these simple methods, each driver can easily determine what size should purchase tyres.

Alternative ways to define good tyre size

When for various reasons it can’t be determined what size tyre fits on your vehicle, it remains consultation in the nearest dealer of the brand, raise the question to the site vulcanizing, read the web content and portal tyre manufacturers: Tyres Online