Overview: The Firma 2800Kv Sensored brushless motor is a great choice for 1/10 scale crawlers, rock racers, and trailers running on 2S – 3S LiPo power. Featuring a low cog 4-pole 8-magnet rotor design, CNC machined aluminum housing, insulated high purity copper windings, high-quality alloy steel 3.175mm (1/8") output shaft, and precision bearings for high durability and smooth rotation. Preinstalled with 3.5mm gold plated bullet connectors for easy installation. The Features: Excellent upgrade for 540 brushed motors with the same diameter and mounting pattern (vehicle must accept pinions with a 1/8" mm bore) Perfect for high speed off-road applications such as rock bouncers and rock racers High-quality 4-pole sintered rotor Polarity protection - magnetic encoder inside the motor guarantees consistency between three phases' signals and always outputs precise signals indicated by rotor position. When installing simply match wire color to esc connectors 3.5mm gold plated bullet connectors Waterproof sensor wire with locking plug and gasket High-quality construction with precision ball bearings and hardened steel 1/8" shaft