This dirt bike helmet mirror adapter is mounted on the chin of the helmet and is designed to fit the following flat oval mirror:
https://www.amazon.com/dp/B0CVMSDZNR?psc=1&ref=ppx_yo2ov_dt_b_product_details
Unlike the side mounted version, the chin mounted mirror isn't prone to vibration when riding over bumps. The flat mirror provides an undistorted rear view.
My helmet is a Troy Lee Designs Stage.
dirt_chin_horn.stl | 1.4MB | |
flat_mirror_holder.stl | 5.6MB |