Brake pad thickness 18mm, heat dissipation floating disc in the middle of the laminating thickening to 3mm. The design of stainless steel floating buckle prevents the external disc from being directly locked with hub, leaving room for expansion. Interior adopts ultra-light thickened aluminum alloy material with unique heat dissipation design for better heat dissipation ability, higher strength and hardness. Five holes 75 fixed connection design provides the most stable force form, while floating structure avoids vibration caused by high temperature longitudinal expansion of the brake disc when braking, improving cycling safety. Added special structure of the heat sink, after heat treatment process, the heat sink and the outer frame continue to contact, equivalent to a heat sink, allowing heat to quickly dissipate.