YIKONG YK4106 Parts Steering servo arm 25T 21020
The steering servo is a 25KG high-torque metal-gear servo. The steering servo horn part number is 21020 (25T). Users report the stock steering servo's torque and speed are "a bit insufficient" and recommend upgrading. Differential lock and shifting use 17G small servos (part number 21110) and 15G servos (part number 21111).

