FIRMA 3900Kv 4-pole BL Motor

Spektrum Firma 3900 Kv 4-pole brushless motor – 5 mm shaft

High rpm for your 1/10 4WD on up to 3S (12.6 V) – and a direct upgrade from 540 and 550 brushed motors with the same diameter and hole pattern (the car must be able to use pinions with a 5 mm bore). The Firma 3900 Kv has a 4-pole low-cogging rotor, a CNC-machined aluminium can, insulated high-purity copper windings and a 5 mm hardened steel shaft on high-precision bearings.

Matched to the Firma 130 Smart ESC, and 4 mm gold-plated bullet connectors are fitted at the factory. The shaft fits SafeD-5 pinions.

Features

• Upgrade from 540/550 brushed – same diameter and hole pattern
• 4-pole sintered low-cogging rotor
• Precision ball bearings and 5 mm hardened steel shaft
• SafeD-5 pinion compatible
• 4 mm gold-plated bullet connectors, pre-installed

Specifications

• Kv: 3900
• Battery: up to 3S (12.6 V)
• Shaft: 5 mm
• Connector: 4 mm bullet
• Matching ESC: Firma 130 Smart
• Scale: 1/10

Note: Works with the Firma 85 A ESC, but only on 2S.

We ship with GLS:

From our warehouse in Denmark.
Shipping is calculated at checkout.
Business customers are welcome.