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Spektrum SPMXSM3300 Firma 3900kv 4-Pole Brushless Motor

Product Code: SPMXSM3300

In-stock items and stock levels are subject to continuous change. Click & collect orders can be used to reserve items prior to in store collection. Store transfers and holds available on request.

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.


  • 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


  • (1) Spektrum Firma 3660-3900kv Sensorless 1/10 Brushless Motor with 4mm Gold Plated Bullet Connectors
  • (1) Product Manual


  • Electronic Speed Control such as the Firma 130 Smart ESC
  • Application : 1/10 Scale Surface
  • Input Voltage : 12.6V
  • Maximum Continuous Current : 45A
  • Motor Type : Brushless
  • Outer Diameter : 1.4" (36 mm)
  • Product Length : 2.35" (60 mm)
  • RPM/Volt (Kv) : 3900Kv
  • Shaft Diameter : 0.2" (5 mm)