We can see tyre ply composition,
these are the textile materials used in composition of tyre as a foundation for the tread blocks.
In old days, only cotton plies were used later replaced by Rayon. Rayon too got replaced by Nylon, Polyamide, polyester etc.
The name of the ply is also prefixed by a number which tells us number of plies used in the tyre tread & the sidewall. ECE /UNECE markings :
Of late, since, 2012 onwards, United nations have passed some regulations so that customers can judge the safety & Eco friendliness of the tyres.
For getting these UN markings on the tyre, tyre manufacturer needs to apply in a member country of UN (Contries who have pledged for safety & anti pollution).
1) Marking is given as a 'encircled' capital 'E'
letter on the sidewall, (E stands for Europe, because these regulations were first formulated in Europe & implemented in all the European countries).
2)Letter E is suffixed by a number code, eg 2,1,4.. etc. This number is the codename of the country in which tyre maker of the particular model applied for passing through the safety & environment criteria.
E4 means Netherlands
E1 means France.
I am posting a pic of the screen shot of the country code names.
Near the encircled E, you can see few numbers & letters. These numbers suggest the number of the law amendments & application number of the tyre maker.
After these number codes, you can see letters 'S' & 'W'
'S' means tyre has passed the Sound (Tyre noise) test conducted in Europe. European laws are least tolerant to the noise, The letter S is suffixed by a single digit number eg 1, 2.
Number '2' suggests that Sound criteria is fulfilled according to second amendment(as of now, latest).
Letter 'W' suggests suggests that the tyre passes through Wet grip safety test. The letter W is also suffixed by a number. This number again points towards number of the amendment in the law. As of now number '2' suggests latest amendment.
After the letter 'W' you can see letter 'R'. I don't know exact meaning of this, but probably it might be Rolling resistance( less is the rolling resistance, more is the fuel economy. UTQG RATINGS:
These markings are as per US laws. Treadwear :
A 12000 km approx. road test is carried out on the tyre & compared with a reference tyre. If treadwear ratings is 300 meaning it can last 3 times more kms as compared to the reference tyre. The reference tyre has got treadwear rating of 100 & lasts usually 11000 to 12000 kms. Traction :
Test is carried out on the wet test roads.
Ratings are given as follows AA
:Best possible wet braking distance. A: B: C:
least acceptable. Temperature :
Lab test carried out to see temperature tolerance due to speed.
Ratings are given as
B[/B]: moderately tolerant C:
least tolerant to the temperature for the tyre specs.
Mefeels, these are the important markings we must see while purchasing tyres. Please note
: all above US & European markings keep changing as per the width, aspect ratio, rim, diameter & speed index & Load index
of the tyres.
Also I saw ply composition different for different sizes. PS :
Of late, I went to a renowned multi brand tyre dealer. He started showing me tyres putting them side by side exposing only the tread patterns.
And asked me to choose a tyre as per my likings.!
Me : "I don't want marry with the tyre, I want to purchase the tires which fulfillls my requirements & VFM