- ESC Type: Brushless Electronic Speed Controller
- ESC Current Rating: 25 amps continuous
- Receiver Type: SLT Protocol Receiver
- Receiver Protocol: Spektrum SLT (Secure Link Technology)
- Integrated Features: Onboard gyro stabilisation system
- Battery Connector: IC2
- Design: 2-in-1 integrated ESC and receiver unit
- Form Factor: Compact design optimised for small-scale RC vehicles
- Target Vehicle Class: Small-scale ARRMA vehicles, particularly GROM models
- Compatibility: Spektrum transmitters supporting SLT protocol
- Included Accessories: Servo mount designed for small-scale ARRMA GROM vehicles
- Manufacturer: Spektrum
- Item Number: SPMXSBER1025G
- Official Rating: 5 out of 5 customer rating from manufacturer
Overview
The SPM Firma 25A 2-in-1 Brushless ESC / SLT Protocol Receiver with Gyro represents a significant advancement in compact RC electronics, delivering professional-grade performance in a single integrated unit. This innovative 2-in-1 solution combines a 25-amp brushless electronic speed controller with a full SLT protocol receiver and integrated gyro stabilisation system, making it an excellent choice for RC enthusiasts in the UK looking to simplify their vehicle setup whilst maintaining exceptional performance. Whether you're building a ready to run RC car or upgrading an existing platform, this compact unit eliminates the need for separate ESC and receiver components, freeing up valuable chassis space and reducing overall system complexity.
Designed specifically for small-scale ARRMA vehicles, particularly the GROM platform, this Spektrum component is engineered to deliver reliable brushless motor control with smooth throttle response and precise directional authority. The integrated receiver eliminates compatibility concerns and binding issues common with separate systems, whilst the onboard gyro provides automatic stabilisation assistance that enhances handling characteristics across varying terrain and driving conditions. This makes it particularly attractive to UK RC car builders and bashers who demand dependable electronics without the weight penalty of traditional dual-component setups.
With a customer rating of 5 out of 5 stars from Spektrum's official product page, the Firma 25A has proven itself in real-world applications. The compact form factor, combined with the IC2 battery connector standard, ensures compatibility with a wide range of modern LiPo battery packs and brushless motor configurations. This is a product that delivers genuine value to hobbyists, weekend racers, and competitive drivers alike, offering the electronics foundation needed for serious RC performance.
Key Features
- 25A Brushless ESC with SLT Protocol Receiver Integrated — This single unit combines both speed control and receiver functionality, eliminating the need for separate components and significantly reducing the weight and complexity of your RC vehicle's electronic systems. The integration means you have fewer connection points to troubleshoot and fewer potential failure points, making your vehicle more reliable during operation.
- 2-in-1 Compact Design — The compact form factor is specifically engineered to fit in small-scale RC vehicles, particularly ARRMA GROM models, freeing up valuable space that would otherwise be consumed by separate ESC and receiver units. This space-saving design allows for improved weight distribution and cleaner internal mounting arrangements.
- SLT Protocol Technology — Spektrum's SLT protocol ensures compatibility with Spektrum transmitters and provides secure, interference-resistant communication between your transmitter and receiver. This proprietary protocol is recognised throughout the RC hobby community for its reliability and range performance.
- Integrated Gyro Stabilisation System — The onboard gyro provides automatic electronic stabilisation, particularly beneficial during high-speed runs or on challenging terrain. This feature automatically corrects unwanted yaw rotation, helping you maintain better control and reducing the learning curve for drivers of varying skill levels.
- IC2 Battery Connector — This industry-standard connector ensures broad compatibility with modern LiPo battery packs, making it straightforward to find suitable power sources for your vehicle and enabling easy battery swaps during extended driving sessions.
- Servo Mount Included — The package includes a dedicated servo mount designed for small-scale ARRMA vehicles, ensuring proper servo integration without requiring additional brackets or adapters. This purpose-built mount fits perfectly within the compact chassis envelope of GROM-scale vehicles.
Technical Performance
The Firma 25A delivers impressive technical performance for its compact size, handling up to 25 amps of continuous current draw, which provides plenty of headroom for small-scale brushless motor systems commonly used in ARRMA GROM and similar vehicles. The integration of the ESC and receiver eliminates the compromises often required when fitting separate components into tight spaces, resulting in a system that can be mounted low and centrally within the chassis for optimal weight distribution and handling balance. The brushless ESC technology provides smooth, linear throttle response with minimal cogging, essential for precise control during high-speed manoeuvres and delicate low-speed maneuvering alike. The SLT protocol receiver operates on Spektrum's recognised secure frequency-hopping system, providing excellent range and immunity to interference from other RC systems operating in the same area. Quality engineering ensures consistent performance across a wide range of battery voltages and motor configurations, with the IC2 connector allowing you to utilise modern LiPo battery technology that delivers superior power delivery compared to older NiMH systems. The integrated gyro stabilisation system uses advanced sensing technology to detect and correct unwanted rotation, providing active assistance that improves handling consistency and reduces the likelihood of tip-overs during aggressive driving.
What's in the Box
- Firma 25A 2-in-1 Brushless ESC / SLT Protocol Receiver
- Servo Mount designed for small-scale ARRMA GROM vehicles
Frequently Asked Questions
- Is the Firma 25A 2-in-1 ESC / Receiver suitable for beginners to RC cars in the UK? — Yes, the Firma 25A is an excellent choice for beginners, particularly those building or upgrading ARRMA GROM vehicles. The integrated design means fewer components to understand and configure, the SLT protocol provides secure communication with Spektrum transmitters, and the onboard gyro stabilisation system actually helps newer drivers by automatically assisting with vehicle control. The 25-amp rating provides suitable power for small-scale brushless motors without being overwhelming.
- What battery type and connector does this ESC use? — The Firma 25A features an IC2 battery connector, which is an industry-standard connector found on most modern RC LiPo battery packs. This means you'll have plenty of options when sourcing batteries, and you can easily swap between batteries during extended driving sessions without requiring adapter cables or connector modifications.
- What is the 25-amp rating and what does it mean for motor selection? — The 25-amp continuous current rating means this ESC can safely handle motors that draw up to 25 amps during normal operation. This is suitable for most small-scale brushless motors used in ARRMA GROM-size vehicles. When selecting a motor, ensure its current draw at full throttle does not exceed 25 amps to maintain safe operation and proper ESC performance.
- Why would I choose a 2-in-1 ESC / Receiver over separate components? — A 2-in-1 design offers several advantages: it saves significant weight by eliminating one component, it reduces the number of electrical connections required, it simplifies installation in compact spaces like the ARRMA GROM chassis, and it reduces the potential for incompatibility issues between separate ESC and receiver units. For small-scale vehicles where space is at a premium, this integrated approach is often the better choice.
- Is this compatible with my existing Spektrum transmitter? — Yes, provided your Spektrum transmitter supports SLT protocol and small-scale RC vehicles (surface vehicles, not aircraft). The receiver can be bound to your transmitter following standard Spektrum binding procedures detailed in the comprehensive instruction manual included in the package.
- What is the gyro feature and how does it improve my RC car's handling? — The integrated gyro is an electronic stabilisation system that continuously monitors your vehicle's rotation and automatically applies corrective steering inputs to maintain your intended direction. This is particularly helpful during high-speed driving on rough terrain, as it reduces tip-over tendency and helps maintain control during aggressive manoeuvres. The gyro effectively acts as a co-pilot, assisting with directional control.
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 25A 2-in-1 Brushless ESC / SLT Rx w/ Gyro, Grom P-SPMXSBER1025G 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.
