Overview
The SpektrumT FirmaT 1/24th Brushless ESC + Motor Combo is a great choice for micro crawlers and more running on 2S LiPo power. It features a high-precision magnetic encoder and rotor position sensor that provides excellent 1 to 1 control feel when driving at any speed and at any angle. Perfectly suited for trail driving and rock crawling competitions. This advancement in sensored motor control allows the ESC to match the throttle input to the motors RPM with unmatched precision. This combo is specifically designed for the Axial® SCX24 & AX24 platform to provide the ultimate performance for maximum power and realism. Preinstalled with 2mm bullet connectors for easy installation.
Features
- Reliable 4500Kv Sensored Brushless Motor with excellent slow speed control
- Drop-in conversion to all Axial 1/24th Scale SCX24 RTR vehicles
- All included - includes motor, ESC, sensor wire and pinion gears
- JST PH 2.0 connector to fit the Dynamite 7.4V 350mAh 2S Lipo Battery
- Crawler Mode: Forward and instant reverse with drag brake
- 8 Amp (40 Amp Burst) 1-2S Compatible ESC
- Compact Size
Note: Axial SCX24 vehicles equipped with HRZ00014 Transmitter and HRZ00015 2-in1 Receiver requires a Transmitter and Receiver upgrade for functionality. Please refer to the manual for more information.
- Scale: 1/24
- Platform: Axial SCX24 and AX24 compatible
- Motor Type: Brushless sensored
- Motor KV Rating: 4500Kv
- Motor Pole Count: 2
- Motor Outer Diameter: 15mm (0.6 inches)
- Motor Weight: 16g
- ESC Type: Brushless sensored
- ESC Maximum Continuous Current: 8A
- ESC Maximum Burst Current: 40A
- ESC Length: 27mm (1.05 inches)
- ESC Width: 15mm (0.6 inches)
- ESC Height: 12mm (0.46 inches)
- ESC Weight: 10g
- Battery Compatibility: 1-2S LiPo
- Input Voltage: 1-2S LiPo
- Battery Connector Type: JST PH 2.0
- Motor Output Connector: 2mm bullet
- Forward Function: Yes
- Reverse Function: Yes
- Reverse Type: Instant reverse
- Braking: Integral with ESC, includes drag brake
- BEC (Battery Elimination Circuit): Yes
- BEC Voltage: 5V
- BEC Continuous Current: 0.3A
- Low-Voltage Cutoff: Yes, auto cutoff
- Overload Protection: Yes
- Water Resistance: Not water-resistant
- Sensored: Yes
- Programmable: No
- Features: Sensored control with magnetic encoder and rotor position sensor, crawler mode with instant reverse and drag brake, compact size, durable brushless design, optimised efficiency
- Included Accessories: Sensor wire, pinion gears, pre-installed 2mm bullet connectors, pre-installed JST PH 2.0 battery connector
- Installation: Drop-in conversion for Axial SCX24 and AX24 platform (Note: vehicles equipped with HRZ00014 receiver and HRZ00015 transmitter require SLT3 transmitter and receiver upgrade)
Overview
The Spektrum Firma 8A Sensored Brushless ESC and Motor Combo represents a significant upgrade for enthusiasts of 1/24 scale rock crawling and micro crawler RC vehicles in the UK. This complete, ready-to-install system is specifically engineered as a drop-in conversion for Axial SCX24 and AX24 platform vehicles, delivering professional-grade performance that transforms your RTR crawler into a competition-ready machine. Whether you're a seasoned rock crawler competing in trail driving events or a dedicated hobbyist looking to extract maximum performance from your micro crawler, this combo offers the precision control and reliability that serious enthusiasts demand.
What sets the Spektrum Firma apart from standard brushed motor setups is its advanced sensored brushless motor technology combined with intelligent ESC control. The high-precision magnetic encoder and rotor position sensor work in perfect harmony to provide exceptional 1:1 control feel at any speed and any angle, whether you're crawling over rocks at walking pace or navigating technical terrain. This sensored motor control allows the ESC to match throttle input to the motor's RPM with unmatched precision, eliminating the dead zones and inconsistencies that plague traditional brushed systems. The result is smoother operation, better control feedback, and the ability to execute technical manoeuvres with confidence.
Designed specifically for the Axial SCX24 and AX24 platform, this combo delivers the ultimate performance upgrade whilst maintaining the compact, realistic proportions these iconic micro crawlers are known for. The system comes completely pre-assembled and pre-programmed, with all necessary connectors already installed, making it a true plug-and-play solution for RC car enthusiasts across the UK looking to upgrade their crawler's drivetrain without complicated installation procedures.
Key Features
- Sensored Brushless Motor Technology — The 4500Kv sensored brushless motor delivers exceptional slow-speed control and smooth operation that's essential for technical rock crawling. Unlike brushed alternatives, this motor maintains consistent power delivery at extremely low speeds, giving you the precise throttle modulation needed for competitive trail driving and realistic rock crawler performance.
- High-Precision Magnetic Encoder and Rotor Position Sensor — This advanced sensing system continuously monitors motor position and speed with exceptional accuracy. The encoder provides the ESC with real-time feedback, allowing it to adjust power delivery instantly to match your throttle input, resulting in superior control feel at any vehicle speed or terrain angle.
- Intelligent ESC Control Matching — The ESC intelligently matches throttle input to motor RPM with unmatched precision, eliminating the lag and inconsistency found in non-sensored systems. This technology enables the kind of smooth, linear throttle response that makes the difference between successfully navigating technical obstacles and losing traction.
- Compact 8 Amp ESC with 40 Amp Burst Capability — The electronic speed controller is rated for continuous 8 amp operation with burst capability to 40 amps, providing sufficient power for aggressive crawling whilst maintaining the compact dimensions essential for 1/24 scale installations. The small footprint ensures easy fitting into Axial SCX24 and AX24 chassis without modification.
- Crawler Mode with Instant Reverse and Drag Brake — Dedicated crawler mode offers instant reverse capability and integral drag brake function, allowing you to execute rapid direction changes and controlled descents on steep technical terrain. This feature is invaluable for competition crawling where precision positioning and brake control directly impact your success.
- 1-2S LiPo Battery Compatibility — The ESC accepts both 1S and 2S LiPo battery configurations, providing flexibility in power delivery and runtime options. The system is pre-configured to work with the standard Dynamite 7.4V 350mAh 2S LiPo batteries included with Axial SCX24 and AX24 vehicles, though 1S alternatives are also supported.
- Complete All-Included System — This combo includes everything needed for installation: the brushless motor, sensored ESC, sensor wire, and pinion gears. Everything arrives pre-installed with 2mm bullet connectors for the motor and JST PH 2.0 connector for the battery, eliminating compatibility concerns and installation complexity.
- Drop-In Installation for SCX24 and AX24 — Specifically engineered as a direct replacement for the standard motor and ESC found in Axial SCX24 and AX24 RTR vehicles, this combo requires no chassis modification or custom fitting. Simply remove your existing drivetrain components and install this system—it's that straightforward for UK RC enthusiasts.
- Durable Brushless Design — Brushless motors require no maintenance compared to brushed alternatives. There are no brushes to wear out, no commutators to service, and no carbon dust to accumulate, meaning your Firma system will deliver consistent performance season after season with minimal upkeep.
- Optimised Efficiency and Extended Runtime — The brushless motor and intelligent ESC are engineered together for maximum efficiency, allowing you to extract longer runtimes from each battery charge. This efficiency advantage means more crawling time between charges and better value from your battery investment.
- Auto Cutoff Protection — The ESC features automatic low-voltage cutoff protection that safeguards your LiPo battery by disconnecting power when voltage drops below safe operating levels. This extends battery lifespan and prevents the cell damage that occurs during over-discharge.
- Integrated BEC Power Supply — The built-in Battery Elimination Circuit (BEC) provides regulated 5V power at up to 0.3 amps continuous output, powering your receiver and servo systems without requiring a separate battery. This simplification reduces weight and complexity whilst improving overall system reliability.
- Overload Protection — Integral overload protection circuitry monitors current draw and thermal conditions, protecting the ESC from damage caused by short circuits, stalled motors, or excessive power draw during aggressive driving conditions.
- Pre-Installed Connectors for Hassle-Free Installation — Both the motor and battery connectors arrive pre-installed and ready to connect. The 2mm bullet connectors on the motor side and JST PH 2.0 battery connector eliminate the need for soldering or complex connector work, making this accessible even for less experienced builders.
Technical Performance
The Spektrum Firma 8A Sensored Brushless ESC and Motor Combo delivers impressive performance characteristics tailored specifically for 1/24 scale rock crawling applications. The 4500Kv brushless motor is engineered to provide excellent slow-speed control—the defining requirement for technical trail driving and competition rock crawling in the UK and beyond. With a compact outer diameter of just 15mm and weighing only 16 grams, this motor fits seamlessly into the tight engine bay of Axial SCX24 and AX24 micro crawlers without any chassis modification. The motor features a 2-pole configuration optimised for smooth power delivery and consistent torque across the entire throttle range, from barely-moving crawl speeds to rapid acceleration when terrain permits.
The 8-amp continuous ESC features class-leading sensored control that continuously monitors motor speed and position through the integrated magnetic encoder and rotor position sensor. This real-time feedback allows the electronic controller to match motor RPM precisely to your throttle input, eliminating the dead zones and lag characteristic of non-sensored systems. The 40-amp burst capacity provides headroom for aggressive driving moments whilst the integrated crawler mode delivers instant reverse with integrated drag brake functionality—essential features for competition rock crawling where precision positioning and brake control directly impact performance. The ESC itself measures just 27mm long, 15mm wide, and 12mm tall (weighing only 10 grams), making it genuinely micro-sized for 1/24 scale installations.
Power delivery is managed through either 1S or 2S LiPo battery configurations, with the system pre-configured for 2S compatibility using standard 7.4V batteries. The integrated 5-volt BEC provides regulated power for receiver and servo systems at up to 0.3 amps continuous output, eliminating the need for separate power supplies. The brushless design delivers superior efficiency compared to brushed alternatives, translating directly into extended runtime from each charge and better energy conservation during extended trail sessions. Water resistance is not specified for this system, making it suitable for dry conditions and light moisture exposure rather than deep water fording, which is appropriate for the rock crawling applications this combo is designed for. Build quality throughout reflects Spektrum's professional engineering standards, with durable construction designed for reliability and longevity even under the demanding conditions of competitive rock crawling.
What's in the Box
- Spektrum Firma 4500Kv sensored brushless motor
- Spektrum Firma 8A sensored brushless ESC
- Sensor wire for motor feedback
- Pinion gears
- Pre-installed 2mm bullet connectors (motor side)
- Pre-installed JST PH 2.0 battery connector
- Instruction manual (multilingual)
What You Need to Complete
- 2S LiPo battery (7.4V recommended; 1S alternative also compatible)
- Battery charger compatible with LiPo chemistry
- Axial SCX24 or AX24 platform vehicle for installation
- For 2021 Ford Bronco, Jeep GT Gladiator, or Jeep Wrangler variants: SLT3 transmitter and receiver upgrade (required for compatibility with HRZ00014 and HRZ00015 radio equipment—refer to manual for details)
Frequently Asked Questions
- Is the Spektrum Firma 8A suitable for beginners to brushless RC crawling? — Yes, absolutely. Whilst this is an advanced ESC and motor combo engineered for serious crawling, the sensored brushless technology actually makes it more beginner-friendly than traditional systems. The sensored control provides better throttle linearity and more predictable response, making it easier to learn precise speed control. The drop-in installation for Axial SCX24 and AX24 vehicles means beginners don't face complex installation challenges.
- What battery does this system require? — The Firma 8A is designed for 1-2S LiPo battery operation. It comes pre-configured for 2S operation and works with standard 7.4V Dynamite batteries included with Axial SCX24 and AX24 RTR packages. The system also supports 1S batteries if you prefer lighter weight and longer runtime options, though 2S is recommended for optimal performance.
- Can I install this in my Axial SCX24 without modifications? — Yes, this is a genuine drop-in conversion specifically engineered for Axial SCX24 and AX24 platforms. All connectors are pre-installed and match the original vehicle wiring. Important note: vehicles equipped with HRZ00014 receiver and HRZ00015 transmitter (including 2021 Ford Bronco, Jeep GT Gladiator, and Jeep Wrangler variants) require an SLT3 transmitter and receiver upgrade for full functionality. Refer to the instruction manual for complete compatibility details.
- What makes sensored brushless control better than standard brushed motors? — Sensored brushless motors use a magnetic encoder and rotor position sensor to give the ESC real-time feedback about motor speed and position. This allows the ESC to match your throttle input to motor RPM with unmatched precision, delivering smoother acceleration, better control at any speed, and superior performance at crawling speeds. The result is dramatically improved control feel and more consistent performance across varied terrain.
- How does the drag brake feature work? — The integral drag brake allows you to apply resistive braking through the motor circuit without moving the servo. In crawler mode, this enables controlled descent on steep technical terrain and helps position your vehicle precisely on obstacles. It's an essential feature for competitive rock crawling where brake control directly impacts your ability to navigate technical sections.
- Is this system waterproof? — No, the Firma 8A system is not rated as waterproof. It's suitable for dry conditions and light moisture exposure typical of rock crawling on rocky terrain, but not designed for deep water fording or submersion. This specification is appropriate for the technical rock crawling and trail driving applications this system is engineered for.
- What's the difference between this sensored system and simpler alternatives? — This sensored system uses advanced magnetic encoder technology and rotor position feedback to continuously monitor motor performance, allowing the ESC to respond instantly to throttle input with precise RPM matching. Non-sensored alternatives rely on open-loop control without real-time feedback, resulting in lag, dead zones, and less predictable throttle response—especially problematic at the low speeds essential for technical crawling. Sensored control is the professional standard in competitive rock crawling.
- Will this system work with my existing batteries and charger? — If you're already using standard 2S LiPo batteries and a LiPo-compatible charger with your Axial SCX24 or AX24, this system works with your existing power infrastructure. The pre-installed JST PH 2.0 battery connector matches the standard Dynamite batteries included with these vehicles. Always ensure your charger supports LiPo chemistry and follow proper charging protocols for safety.
Why Buy from RC Model Shop?
RC Model Shop is a trusted UK RC retailer and authorised dealer for all the brands we stock, including Traxxas, ARRMA, Losi, FTX, Hobbywing, Spektrum and more. Based in Walsall, we have a physical store where customers are welcome to come in, view products and purchase in store. Whether you are a seasoned competitor, a weekend basher, or just discovering the world of RC for the first time, our team of experienced RC enthusiasts is here to help you find the perfect setup and provide ongoing support. Order the SPM Firma 8A Sensored Brushless Smart ESC / Brushless Sensored M P-SPMXSEMC18 today with confidence, knowing you are buying from an authorised retailer with genuine products, expert knowledge and a commitment to customer satisfaction. Shop online or visit us in Walsall — we look forward to helping you get the most out of your RC experience.
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