"Load capacity index" means a figure associated with the maximum load a tyre can carry at the speed corresponding to its speed symbol according to the operating conditions specified by the tyre manufacturer. A list of those indices and of the corresponding loads is given for you reference. 

“Cord” & “PLY” for Motorcycle Tires

(1) "Cord" means the strands forming the fabric of the plies in the pneumatic tyre; The most commonly used nylon material in motorcycle tires, such as nylon 66, is a very tough polymer material with high strength and toughness, which is very suitable for tire structural materials

(2) "Ply" means a layer of rubber-coated parallel cords; PLY
The more PLY, the higher the strength of the tire carcass structure. In the past, tires with 4 or 6 PLY or even 8 PLY were popular, but with the advancement of technology, the strength of the cord has increased a lot. Tires using 2 ply cord are very common these days. However, when PLY is still marked according to the traditional 4PR (4PLY) or 6PR (6PLY )

Pros and Cons of Butyl Inner Tubes

Advantages:

(1)Most tubes are made of butyl rubber. It is very elastic and holds air well.
(2) Price: Butyl tubes are more cost less than latex or thermoplastic.
(3) Pressure Loss: Butyl tubes lose air very slowly.

Disadvantages :

(1) Puncture Protection: Butyl tubes are usually not as puncture resistance as their counterparts.
(2) butyl rubber is often not the lightest material , the ultralight versions of butyl tubes use a very thin wall thickness to compensate for weight, which then reduces their durability, whereby negating one of the key strengths of the material in the first place.
(3) the level of elasticity of butyl rubber is slightly lower than with some other tube materials, which contribute to increased internal friction between the tube and the inside of the tyre, causing negative effects on rolling resistance in high performance use.”

The most popular bicycle inner tubes and motorcycle inner tubes are made from butyl rubber, which is a synthetic elastomer made by combining isobutylene and isoprene. This material is an excellent opinion for inner tubes, as it show quite positive shock absorption characteristics & durability, while keep low moisture and gas permeability, to maintain internal pressure at least 3~6 month or more. it is better than nature tubes on this factor .

On the cost ,our butyl tube is almost same with nature tubes due to new technology and rubber formular is introduced

Butyl inner tubes are known for their classic black color, durability, and low cost & gas permeability , which provide an effective solution for a large population of users.

For these reasons, butyl tubes are widely used commercially. For example, these are most likely the tubes on your new bike, or that a shop may use to replace old tire. In the event of a puncture, butyl tubes are easy to patch using an inexpensive patch kit, which is readily available at bike shops, as well as most hardware stores. These patches are applied using rubber cement, and have a similar elasticity to the tube itself, ensuring a positive repair.