4. With the effort of 50 technicians, SUYU develops diversified axles with  different sizes and types that have various applications. Meanwhile, owing to our strict quality control system, the product enjoys high quality and a good  reputation all over the world.

5. Basically a parabolic spring is a spring that consists of two or more leaves. The leaves touch only in the center, where they are fixed to the axle  and at the outer ends, where they are fixed to the vehicle. In between those two  points the leaves do not touch each other as they do with conventional leaf  springs.

Each leaf represents a complete spring in its self and will act as  such. To enable the leaf spring is tapered, from the center (thick) to the outer  ends (thin). This tapering is parabolic, it means that every centimeter (or  inch) the thickness of the leaf decreases in an amount that relates to the  square function of it's length.

This may sound complicated but in fact it is very simple. Every single leaf will have, more or less, the shape of a complete  multi leaf spring and thus it's capable to cope with the same forces. This means  that the ideal parabolic spring could have only one leaf, however, this type of  "mono leaf" spring will have very limited articulation/weight ratio due to high  internal stresses so a 2 or 3 leaf parabolic spring can divide the stresses more  evenly across the other leaves and thus more axle movement is possible. That is  why we designed 2 and 3 leaf springs. An other reason to increase the number of  leaves on a parabolic spring is to increase the rate (load capacity). Because every leaf is one spring we can add or take out leaves without compromising the  strength of the leaf it self. So for example we have a 3 leaf rear spring and we  add one similar leaf the rate will go up for about 30% which means that the load capacity increases by +/- 30% (depending on the shackle effect)