Spektrum Firma 3900Kv 4-Pole Brushless Motor

Overview
Great choice for 1/10 Scale 4WD models looking for a high RPM motor upgrade running up to 3S * (12.6v) power. Low cog 4-pole rotor design, CNC machined aluminum housing, insulated high purity copper windings, high-quality alloy steel 5mm output shaft, and high-precision bearings for high durability and smooth rotation. Preinstalled with 4mm gold plated bullet connectors for easy installation. Perfectly matched for the Firma 130 Smart ESC.

*Will work with the 85A Firma ESC, but only for 2S power.

Features
Perfect upgrade for brushed 540- and 550-size brushed motors with the same diameter and mounting pattern (vehicle must accept pinions with a 5mm bore)
High-quality 4-pole sintered rotors
Includes 4mm gold plated bullet connectors
Precision ball bearings and hardened steel 5mm shaft
SafeD-5 Pinion compatible

Product Specifications
Application 1/10 Scale Surface
Shaft Diameter 0.2" (5 mm)
Connector Type 4mm Bullet
Motor Class 1/10 Scale
Product Length 2.35" (60 mm)
Integrated ESC No
Input Voltage 2-3S/12.6V
Kv Rating 3000Kv or more
Motor Output Lead 4mm
RPM/Volt (Kv) 3900Kv
Sensor Type Sensordless
Constant Wattage 500-749W
Maximum Continuous Current 45A
Motor Type Brushless
Outer Diameter 1.4" (36 mm)