Features
- Large 5684 can size to fit the demands of giant scale crawlers and scalers
- FOC (Field-Oriented Control) equipped
- 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
- 4mm gold plated bullet connectors
- Waterproof sensor wire with locking plug and gasket
- High-quality construction with precision ball bearings and hardened steel 5mm output shaft
Overview
The Firma 1200Kv Sensored Brushless Motor is a great choice for giant scale crawlers, rock racers, and trailers running on 2S – 4S LiPo power. Specificly sourced for the Axial® SCX6™ platform to provide the ultimate performance for maximum power and realism. Featuring a low cog 4-pole 8-magnet rotor design, CNC machined aluminum housing, insulated high purity copper windings, high-quality alloy steel 5mm output shaft, and precision bearings for high durability and smooth rotation. Preinstalled with 4mm gold plated bullet connectors for easy installation.
The SPEKTRUM FIRMA 120A SENSORED BRUSHLESS SMART CRAWLER ESC IS REQUIRED.
- Brand: Spektrum
- Model Number: M-SPMXSM3100
- Motor Type: Brushless Sensored
- Scale: 1/6
- Can Size: 5684
- KV Rating: 1200Kv
- Pole Count: 4-pole
- Magnet Count: 8-magnet rotor
- Rotor Type: Low-cog sintered rotor
- Control Technology: FOC (Field-Oriented Control)
- Housing Material: CNC machined aluminium
- Winding Material: Insulated high purity copper
- Output Shaft: Hardened steel 5mm shaft
- Bearings: Precision ball bearings
- Power Connectors: 4mm gold-plated bullet connectors (pre-installed)
- Sensor Type: Magnetic encoder with polarity protection
- Sensor Wire: Waterproof with locking plug and gasket
- Battery Compatibility: 2S, 3S, 4S LiPo
- Battery Type: LiPo
- Required ESC: Spektrum Firma 120A Sensored Brushless Smart Crawler ESC
- Application: Giant scale crawlers, rock racers, trailers
- Included Items: Motor, waterproof sensor wire with locking plug and gasket, pre-installed 4mm gold-plated bullet connectors
- Water Resistance: Waterproof sensor connection (motor case not submersible)
Overview
The Spektrum Firma 1200Kv 1/6 Sensored Brushless Crawler Motor with 5684 Can Size is a purpose-built powerplant specifically engineered for giant scale crawlers, rock racers, and trailer platforms running on 2S to 4S LiPo battery power. This high-performance brushless RC motor has been meticulously sourced and designed to deliver the ultimate performance and realism for demanding RC enthusiasts in the UK who are serious about their crawler builds. Whether you're piloting the Axial SCX6 platform or other large-scale crawlers, this motor provides exceptional torque characteristics and smooth power delivery that serious RC drivers demand.
Built with precision engineering and premium materials throughout, the Firma 1200Kv motor represents the gold standard for sensored brushless RC motors in this class. The 1/6 scale designation and substantial 5684 can size mean this motor has been engineered with the physical demands of giant scale crawling in mind, offering the durability and power output needed for rock crawling, trail running, and extreme terrain navigation. If you're searching for a high-quality brushless RC motor for your 1/6 scale crawler or looking to upgrade your existing setup with proven, reliable performance, this Spektrum motor is an excellent investment.
The integration of Field-Oriented Control (FOC) technology ensures that every ounce of electrical power is converted efficiently into smooth, responsive mechanical output. This makes the motor responsive to throttle inputs whilst maintaining excellent low-speed control—a critical characteristic for precision crawling and obstacle negotiation. The sensored design means real-time feedback of motor position, allowing compatible ESCs to deliver optimal performance across the entire speed range.
Key Features
- Large 5684 Can Size — The substantial motor housing is specifically designed to fit the demanding requirements of giant scale crawlers and scalers, providing adequate space for the high-quality internal components and ensuring optimal thermal management during extended running sessions on challenging terrain.
- FOC (Field-Oriented Control) Technology — This advanced control algorithm provides smooth, efficient power delivery across the entire throttle range, allowing your RC crawler to respond precisely to control inputs whilst maintaining exceptional low-speed torque characteristics essential for technical climbing.
- High-Quality 4-Pole Sintered Rotor — The low-cog 4-pole rotor design with 8 magnets delivers consistent, predictable power output and smooth rotation characteristics, whilst the sintered construction provides durability and reliability needed for demanding crawling applications.
- Polarity Protection with Magnetic Encoder — The built-in magnetic encoder guarantees consistency between the three phase signals and always outputs precise signals indicated by rotor position, eliminating guesswork during installation—simply match the wire colour to your ESC connectors for correct polarity setup every time.
- 4mm Gold Plated Bullet Connectors — Premium quality connectors with gold plating ensure reliable electrical contact, reduced resistance, and easy installation or disconnection, providing a professional finish and peace of mind regarding connection integrity during rough terrain driving.
- Waterproof Sensor Wire with Locking Plug and Gasket — The sealed sensor connector with locking mechanism and gasket provides protection against water ingress, essential when crawling through streams, puddles, and wet terrain conditions common in UK trail driving.
- CNC Machined Aluminium Housing — The precision-machined aluminium motor case provides excellent heat dissipation during operation, maintaining optimal temperature for consistent performance whilst offering superior durability compared to plastic housings.
- Insulated High Purity Copper Windings — Premium copper winding construction with proper insulation ensures maximum electrical efficiency, reduced heat generation, and extended motor lifespan even under sustained high-load crawling conditions.
- Hardened Steel 5mm Output Shaft — The robust 5mm output shaft is engineered for durability, providing reliable power transmission to your driveline whilst resisting wear and damage from rock strikes and obstacle impacts common in crawling.
- Precision Ball Bearings — High-quality ball bearings ensure smooth rotation with minimal friction, translating to better efficiency, cooler running temperatures, and longer motor lifespan during hundreds of hours of crawling enjoyment.
Technical Performance
The Spektrum Firma 1200Kv Sensored Brushless Crawler Motor is engineered with meticulous attention to performance specifications and build quality. The 1200Kv rating combined with the 4-pole, 8-magnet rotor design delivers the perfect balance of torque and top-end speed for 2S to 4S LiPo powered giant scale crawlers. The motor's substantial 5684 can size accommodates a large, efficiently designed stator and rotor, allowing for excellent heat dissipation and prolonged performance during demanding trail sessions. The sintered rotor material provides magnetic consistency and durability, whilst the CNC-machined aluminium housing offers superior engineering precision and thermal properties. With its hardened steel 5mm output shaft, precision ball bearings, and insulated high purity copper windings, this motor is built to withstand the rigorous demands of RC crawling. The sensored design requires a compatible brushless ESC such as the Spektrum Firma 120A Sensored Brushless Smart Crawler ESC (sold separately) to unlock the full potential of field-oriented control technology. The 4mm gold-plated bullet connectors ensure reliable power delivery, whilst the waterproof sensor wire with locking plug protects against water damage during wet terrain driving. This is a true precision instrument for serious RC crawlers who demand reliability, smooth power delivery, and long-term durability.
What's in the Box
- Spektrum Firma 1200Kv 1/6 Sensored Brushless Crawler Motor (5684 Can Size)
- Waterproof sensor wire with locking plug and gasket
- 4mm gold-plated bullet connectors (pre-installed)
What You Need to Complete
- Spektrum Firma 120A Sensored Brushless Smart Crawler ESC (required to operate the motor)
- 2S, 3S, or 4S LiPo battery pack (capacity and discharge rating depending on your specific crawler platform)
- RC transmitter and receiver system compatible with your crawler platform
- Motor mounting hardware specific to your crawler chassis
Frequently Asked Questions
- What ESC does the Firma 1200Kv 1/6 Sensored Motor require? — This sensored brushless motor requires the Spektrum Firma 120A Sensored Brushless Smart Crawler ESC to operate. The sensored motor design provides real-time feedback to the ESC, allowing it to deliver optimised performance with field-oriented control technology. Non-sensored ESCs cannot properly utilise this motor's capabilities, so using a compatible sensored ESC is essential.
- What battery power should I use with this 1200Kv crawler motor? — The Firma 1200Kv motor is designed to run on 2S, 3S, or 4S LiPo battery packs. The specific battery capacity and discharge rating will depend on your particular crawler platform and driving style. Lower cell-count batteries (2S) will provide more torque-oriented performance, whilst higher cell counts (3S or 4S) will increase top-end speed. Always consult your crawler's manufacturer recommendations for optimal battery specifications.
- Is this motor suitable for beginners or experienced crawlers only? — Whilst this is a high-performance, precision-engineered motor ideal for serious crawler enthusiasts, its straightforward installation (with colour-coded sensor wires and polarity protection) makes it accessible to intermediate and advanced RC drivers. However, beginners should ensure they have a compatible sensored ESC and understand brushless motor setup before attempting installation. If you're new to RC crawling, we recommend consulting our experienced team at RC Model Shop for guidance.
- What makes the 5684 can size important for 1/6 scale crawlers? — The large 5684 can size provides sufficient internal volume for a substantial stator and rotor, allowing for optimised magnetic field strength, efficient copper winding design, and excellent heat dissipation characteristics. This larger size is specifically engineered for the demanding torque requirements of giant scale crawlers, ensuring the motor can deliver consistent power during rock crawling, climbing, and sustained off-road driving without thermal degradation.
- What is field-oriented control (FOC) and why does it matter? — Field-oriented control is an advanced motor control algorithm that optimises the interaction between the motor's magnetic fields and electrical current for maximum efficiency and smooth power delivery. FOC technology provides superior low-speed torque control (essential for technical crawling), more responsive throttle feel, cooler running temperatures, and more efficient use of battery power. Crawlers with FOC-equipped motors demonstrate noticeably improved performance in rocky, technical terrain.
- Is this motor waterproof? — The motor housing itself is not fully submersible, but the sensor wire features a waterproof connector with a locking plug and gasket that protects against water ingress through the sensor connection. This makes the motor suitable for crawling through streams, puddles, and wet terrain commonly encountered on UK trail courses. However, avoid fully submerging the motor case itself in water.
- Can I use this motor with non-Spektrum ESCs? — This sensored motor is optimised for use with Spektrum sensored brushless ESCs. Whilst some third-party sensored ESCs may be compatible, we strongly recommend using authentic Spektrum components to ensure proper signal compatibility and optimised performance. Always verify ESC compatibility before purchasing.
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 1200Kv 1/6 Sensored Brushless Crawler Motor with 5684 Can Size – M-SPMXSM3100 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.
We want to make sure your delivery goes smoothly, so here are some important details about our service:
- For orders above £120, we offer delivery to most mainland UK addresses. For orders under £120, we can still deliver to Northern Ireland and the outlying isles, as long as the item can be sent by Royal Mail, weighs less than 30kg, and fits within 61cm × 46cm × 46cm. Some highland and remote areas may carry an extra delivery charge as couriers often apply surcharges in these locations. If you live in one of these areas, feel free to contact us before ordering so we can confirm the delivery options and costs for you.
- Most of our products include delivery in the price. If your order is under £90, a small delivery fee will apply but do not worry this will always be clearly shown at checkout before you complete your purchase.
- Depending on what you choose at checkout, your order will usually be delivered either the next working day or within 2 working days. For next day delivery please place your order before 2:00pm. Orders are dispatched Monday to Friday only. Some items may take a little longer and if that is the case we will always show the expected delivery time on the product page.
- If your order includes items with different dispatch times we will normally wait and send everything together once all items are in stock. If one of the items is going to take a while we will give you the choice either wait for everything to arrive or let us send the available items now and deliver the rest later. It is up to you.
- We use trusted delivery partners to make sure your order gets to you safely and on time. We use DPD for next working day deliveries and Royal Mail for the 2 day option.
- As soon as your order is on its way we will send you a tracking number by email. If you provide your mobile number at checkout we will also send delivery updates straight to your phone so you can keep an eye on progress.
- If a product is marked as "Dispatched within 3 working days" delivery usually takes around 3 to 5 working days from when your order is placed.
- For customers in Inverness and other parts of the Scottish Highlands deliveries can take up to 2 working days even if you select next day delivery as couriers do not currently offer a guaranteed next day service to those areas.
