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Understanding Tyre Markings |
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Wednesday, 05 September 2007 |
The writing and symbols on the sidewall of your tyre can tell you
a lot about the tyre itself, such as what weight it can carry and its
maximum speed. This helpful guide will show you what's what, so that
you can read the writing on the wall. The writing on the sidewall of
your tyre is like a specification sheet - it tells you everything
you need to know about the tyre.
This article was provided by Toyo, our chosen tyre manufacturing partner. A full version of the article can be found here.
This information includes details of the tyre's country of origin,
size, speed rating, type approval,loading capability, model number and
much, much more. Of course, some of this data is stuff only a tyre
technician will find useful, but there are several details you will
find handy too.

Let's use the Proxes T1-S 265/40ZR17 96Y above as an example
Proxes T1-S- The Toyo pattern name.
265 - The nominal section width of the tyre in millimetres.
40
- The aspect ratio of the tyre, (the ratio between the section height
and section width). If no figure is shown it is normally 82.
R -
Radial construction. All Toyo’s car tyres sold in the UK are radial
except for certain special tyres such as space saver spares.
17 - The diameter of the rim shown in inches.
96 - The load capacity of the tyre shown as an index. which should be looked up on the load index scale table here. In this case the load capacity of the tyre at the correct inflation pressure is 710kg.
Y
- The speed symbol, i.e. the maximum sustainable speed for the tyre at
the load capacity given - in this case 186.4mph. View the Speed Table here
Steel
Belted Radial - as with the letter "R", this refers to the tyres
construction. "Steel Belted" is a particular form of radial
construction.
DOT - the type approval mark of the American
Department of Transport, showing that our tyres have passed their
strict testing procedures. When a tyre has passed both the American and
European test programmes, you know you can have complete faith in it.
CXKA
6HY47887 - this is Toyo's production code marking, an internal code
that allows us to determine exactly where and when a tyre was made.
E4
0213760 - the ECE type approval mark and number, showing that our tyres
have been tested and passed as high-quality by the European regulatory
authorities.
Made in the Japan - the country where your Toyo tyre was made.
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Last Updated ( Thursday, 10 January 2008 )
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