Size needn’t limit performance; the Hobbywing XRotor Micro 40A is a 20x20MM 4in1 ESC that out performs some ESCs twice its size. It can handle 3S-6S voltage and up to 40A per channel! It also features the latest in ESC technology, so it has a 32bit MCU with a running frequency of up to 48MHz and has installed 3rd-generation BLHeli-32firmware. Finally, the 4in1 ESC has a built in voltage and current sensor.
The XRotor 40A will surely be one of the premier choices for racers looking for a small form factor ESC that delivers big on performance.