Helmspoiler

Rear spoilers manage the air that a fast helmet has to cut through. Genuine aero parts from Arai, Nexx and MT Helmets — replacement spoilers and optional aero kits that reduce buffeting and lift at speed.

These are model-specific components, developed in the wind tunnel for one shell shape — a spoiler for the wrong helmet does nothing for stability. Check the listed compatibility, and if you are replacing a damaged part after a drop, inspect the shell around the mounting points too.