The tyre’s sidewall has a lot of information that would be useful for you in many ways. The label might become overwhelming by the owner during the first glimpse. The information includes the model of the tyre, speed rating, load index, construction, size of the tyre, and many other vital statistics. These factors determine if the dimensions are suitable for your vehicle or not.
Width, diameter, and size of tyres
If your tyre sidewall has a marking that reads 204/54R15, this means that the tyre’s width is 204mm with an aspect ratio of 54%. The aspect ratio is the ratio of the width and height of the tyre calculated in percentage. The diameter of the rim is measured from one rim edge to another diagonally. It is measured in inches. R means the tyre is a radial tyre. The other examples could be ‘D’ for Diagonal and ‘B’ for bias-ply construction.
Radial car tyres are the most used tyres in the world today.
Rubber car tyres have been replaced by diagonal car tyres and are more rigid given the diagonal fabric layers. More resistance indicates that the cross-ply car tyres heat faster and ultimately wear faster. The name of radial car tyres is due to its construction.
The load index mentioned in the sidewall or vehicle’s handbook mentions the outermost limit of load a car tyre may be put through. This may depend on the speed of driving and the pressure of inflation as well. The load limit should never exceed as it could cause serious damages to the car tyre. To ensure increased longevity of car tyres Loughborough and complete safety, the capacity of load should be always kept in mind.
Tyre markings decoded
To summarize and understand the markings, let us take an example:
223/43 R 16 85 H
- Width of the tyre: This is mentioned as the first number in the series ‘223’. This is measured from one end of the sidewall to the other end and its unit is in mm.
- Aspect ratio: The following number is the aspect ratio; in this case, it is ‘43’. This ratio is calculated by dividing the section height of the tyre by the section width of the tyre.
- Construction: The letter ‘R’ indicates that it is a radial care tyre. For other types of tyres, the initial is used to help the owner identify the construction of the tyre.
- Diameter of the rim: The ‘16’ number indicates the diameter of the rim measured in inches.
- Load index: In this marking, ‘85’ is the load index which is the maximum weight a tyre could support being inflated completely
- Speed rating: The last letter in the entire sequence is the speed rating. Each of the letters ranging from A to Z indicates the highest speed a car tyre can carry in the load capacity suggested by the manufacturer. In this case, ‘H’ equals the highest speed of 209 kilometres per hour.
- Other markings:
– There are markings for tyres with unique treads with an arrow concerning the ‘rotation’, ‘direction’ or ‘direction of rotation’ and signifies the direction which would be best to mount the tyres.
– Labelling of ‘tubed’ or ‘tubeless’ car tyres to signify if the tyre has a tube inside. Modern cars mostly have tubeless car tyres. Run-flat car tyres are also a type of tubeless car tyres
– The symbol ‘M+S’ on tyres means tyres especially to be used on mud and snow in the winter season with muddy or snowy roads. This could be seen in winter as well as all-season car tyres. The alternate representation is a three-peak mountain with a snowflake.
– There are letters ‘TWI’ which is an abbreviation of tread wear indicator. This helps in keeping a check on the depth of the tyre’s tread.
The sidewalls of Falken tyres Loughborough, therefore have a lot of information helping the owner purchase the correct set of new tyres for his/her car in the future.