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PAX System

With the PAX system, the tyre wheel is made of steel or steel alloy (Michelin

Inc, 2006). The diameter of the wheel is wider than an equivalent standard wheel.

Most of the tyre designs use inflation pressure to hold the tyre to the rim, which

makes the tyre separate easily from the rim when a flat occurs at high speed.

However, the design of a PAX system wheel actually improves its grip when vertical

loads are applied to the tyre. The repairable tyre and reusable support ring can provide

a longer life for tyres. Additionally, these tyres have shorter and more flexible

sidewalls, which can reduce rolling resistance by reducing tyre roll. This also helps to

prolong the life of the tyre.

By using these unique designs, tyres can be made to last longer,

thereby reducing tyre waste (Michelin Inc, 2006). By implementing these

technologies into Hong Kong’s transportation infrastructure it may be possible to

slow the accumulation of tyre waste, though it is uncertain whether these methods

will be cost effective. Furthermore, it is unknown if these tyres will complicate

recycling or retreading procedures due to their unique design and composition.


Each material that goes into a tyre has value by itself. Steel can be melted

down, and pure rubber is easily recyclable, but the problem lies in the fact that all

these materials are strongly bound and mixed together with a mix of potent chemicals

that makes separation a difficult and costly process. For this reason tyre recycling is

not an easily profitable business (Rodriguez et al, 2001). We will outline several

recycling methods in the next section that have had varying degrees of success.


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