4iiii4iiii is a Canadian company that designs and sells bicycle power meters (including dual‑sided PRECISION models) and related accessories, plus heart rate monitors and training apps. They offer a mail‑in installation service where customers ship in their crank to have a power meter installed and returned, enabling riders to ride with ready-to-use power data. They provide manuals, support resources, dealer networks, and educational content to help athletes train with power and improve performance.