Servos are powered by the ESC's output to the receiver. If you're using a higher-strength servo than the ESC can support (usually greater than 20kg), you may experience 'brown-outs' where the radio signal can be interrupted and cause erratic driving. This can be helped by plugging a Glitch Buster into the receiver smoothing the current delivery. However, in some cases, you may need to install an external BEC. The incredibly popular LW-20MG servo is very universal and is great for a lot RC cars and boats. Features a 20kg torque rating which is massive and is enough to easily steer big wheels like found on the Arrma Kraton and Outcast. The Power HD LW-20MG 20kg servo will work for most 1/10 and 1/8 RC cars and is particularly popular in the rock crawling and 1/8 off road categories. This servo has metal (brass and copper gears) if you have a very high load application such as a rock crawler without a servo saver, we recommend the 23kg servo which has metal (steel and titanium gears) that are stronger. Power HD LW-20KG Servo SpecificationsTotal Height (A ) = 44.6mm. Body Width (B ) = 40.6mm. Below Mount (C ) = 28mm. Above Mount (D ) = 16.6mm. Total Length (E ) = 54.2mm. Total Width (F ) = 20.5mm. ? Learn how to install a steering servo correctly to increase steering performance, and avoid stripping your servo gears out.