The speed control used here is the Tamiya TEU-101BK. It has proven to be a reliable ESC (Electronic Speed Control) for hobby RC cars. Since our prototype also uses a standard 540-sized motor (27 turns), this ESC is the perfect choice.
The ESC is held in place again by Velcro tape fixed to the front suspension box. Additionally, a metal bar (dark gold piece) envelops the ESC to provide extra support.