Advnatages of the double kingpin trucks
New Gravity Casting Technology:
1. Aluminum liquid flow into truck mould by liquid's weight naturally, this way can delete mould's inside air clearly.
2. do heat treatment after demoulding (truck surface is a little rough because of heat treatment). Prouction time is longer than old die casting technology, and the production cost is twice than before.
3. Hardness reached out HRB65 around, which can stand over 150kg weight for professional skateboarders.