3-inch micro motor (PU yellow rubber Hall effect model): Exclusively adapted for 70mm diameter × 55mm tire width, the PU yellow rubber tread improves wear resistance and cushioning; the center through-hole shaft structure facilitates integrated installation, and the built-in Hall effect sensor achieves high-precision signal feedback. It is suitable for micro smart devices, precision transmission scenarios, etc., and supports bulk purchase to meet the core needs of equipment manufacturers for "small size + high precision"!