The cord is the skeleton of the tire, especially for bias tires.
The thin thread coming out of the tire vent hole can be seen in a certain degree of quality, but it is not absolute.
In some cases, different sizes can be replaced to use in your motorcycle.
TT tire must use the inner tube, TL tire can be used or not.
TT means tube type, TL menas tubeless.
There are many symbols on a motorcycle tires. usually including: size,brand,tire type(TT/TL),ply rating,load capacity,speed symbols,rotation,the certification ID(such as DOT,ISO,ECE,etc),TWI,sometimes, also have the manufacture’s mold ID.