What truly sets this Hobbywing combo apart is the integration of built-in Bluetooth connectivity, real-time data recording capabilities, and intelligent torque management that keeps your crawler performing consistently whether you're climbing or descending. The 1400kV motor specification provides the perfect balance of power and control for 1/10 scale rock crawlers, whilst the sensored FOC system ensures that your throttle inputs are translated into precise motor RPM matching under all driving conditions.

Key Features

• Field-Oriented Control (FOC) Technology — This revolutionary new sensor technology represents a major leap forward for RC crawlers, allowing the ESC and motor to work together with exceptional precision. The FOC system continuously matches motor RPM to your throttle position under all driving conditions, whether climbing uphill, descending downhill, or driving under heavy load, ensuring your crawler responds exactly as you command it.
• Extreme Silence Operation — FOC technology eliminates the annoying PWM (pulse width modulation) noise that plagues traditional brushless systems, creating a whisper-quiet driving experience that makes your crawler a pleasure to operate without audio distraction.
• Intelligent Torque Output and Closed-Loop Speed Control — The ESC continuously monitors and adjusts motor torque and RPM based on driving conditions, maintaining consistent performance whether you're navigating obstacles, climbing steep grades, or holding position on a hillside, eliminating the unpredictable behaviour of standard systems.
• Professional Drag Brake with 200% Enhanced Performance — The sophisticated drag brake system allows scalers to adjust both the drag brake rate and how quickly it applies, enabling smooth high-speed driving without sudden jerks when releasing throttle. The drag brake capacity is rated 200% higher than standard crawling brushless setups, providing superior hill-holding capability and precise parking precision.
• Battery Reverse Polarity Protection — This innovative safety feature protects your ESC and motor from damage caused by accidentally reversing battery connections, a feature claimed to be the first of its kind in the RC car industry and eliminating one of the most common installation errors.
• IP-67 Waterproof Rating — Both the ESC and motor feature complete waterproof sealing with robust heatsink case design, allowing the system to function reliably in wet conditions, muddy terrain, and harsh weather without requiring additional waterproofing steps or maintenance procedures.
• Built-in Bluetooth Module — The ESC includes integrated Bluetooth connectivity that allows direct smartphone connection via the free Hobbywing HW Link V2 mobile app, eliminating the need for external modules, additional wires, or proprietary programming boxes.
• Real-Time Data Recording and Telemetry — Connect to your smartphone to monitor throttle position, battery voltage, current draw, motor temperature, RPM and other vital data in real time, with an effective Bluetooth range of approximately 3 metres.
• Patented Staggered Pole Rotor Design — The motor features an innovative rotor design that creates ultra-low torque ripple, eliminating cogging effects and providing smooth, consistent power delivery with clean deceleration and improved precision throttle control under any load condition.
• Built-in High-Precision Magnetic Encoder — This advanced sensor technology provides far more detailed motor information to the ESC compared to standard Hall-effect sensors, enabling improved performance, efficiency, and responsiveness throughout the entire operating range.
• Dual Running Mode Support — The system supports both classic rock crawler mode (forward and reverse) and standard forward/reverse with brake mode, allowing users to configure the system for their specific application and driving style.
• Super Internal Switch-Mode BEC — The built-in voltage regulator delivers up to 13 amps of continuous current with adjustable output between 6V and 7.4V, allowing compatibility with standard servos, high-voltage servos, and various other RC peripherals without requiring external power modules.
• Advanced Electronic Switch — The secure electronic switch features a dust, dirt and waterproof housing design that ensures long reliable operation and eliminates the problems commonly encountered with mechanical on/off switches in muddy, wet conditions.
• Multiple Programmable Settings — Comprehensive configuration options including timing adjustments, boost settings, and numerous other parameters allow you to fine-tune the system to perfectly match your specific crawler setup and driving preferences.
• Innovative Sealed Sensor Harness — The brand-new waterproof sensor connector design features O-ring sealing and a screw-together construction that prevents loosening, handling water, mud and dirt without requiring additional protective measures.

Technical Performance

The Hobbywing AXE540L R2 1400kV combo represents the pinnacle of modern brushless crawler engineering, combining a precision-tuned 1400kV sensored brushless motor with an 80-amp continuous (480-amp peak) ESC specifically optimised for rock crawling applications. The 1400kV motor specification delivers maximum torque whilst maintaining excellent control characteristics, making it ideal for larger-scale 1/10 crawlers where powerful yet controllable low-end response is critical. The motor dimensions of 36mm outer diameter and 57.8mm length, combined with a 3.175mm shaft diameter, ensure compatibility with standard 540-size crawler motor mounts found on popular platforms including Traxxas TRX-4 variants, TRX-4 Defenders, TRX-4 Sport models and other leading 1/10 scale crawler platforms. Weighing just 232 grammes, the motor maintains excellent weight distribution characteristics essential for rock crawling performance.

The ESC is engineered with robust construction, measuring 47.4mm × 36.2mm × 26.5mm and weighing only 108 grammes including input wiring, allowing installation in tight chassis layouts without compromise. Continuous current rating of 80 amps with peak capacity of 480 amps ensures the system can handle sustained climbs and sudden power demands without thermal shutdown, whilst the intelligent power management prevents performance degradation during extended driving sessions. Battery compatibility spans 2-3S LiPo (7.4V to 11.1V) and 6-9 cell NiMH battery packs, providing flexibility in power source selection. The switch-mode BEC delivers up to 13 amps at selectable 6V or 7.4V output, sufficient to power multiple high-torque servos and receiver systems simultaneously. Black 14-gauge wires measuring 200mm simplify installation into standard RC chassis layouts, whilst the XT-60 battery connector ensures secure reliable power connections. The system's IP-67 waterproof rating means you can confidently operate in rain, through streams, across mud and through other challenging environmental conditions common in UK trail running locations, with both motor and ESC completely sealed against water ingress.

What's in the Box

• Hobbywing XERUN AXE540L R2 brushless motor (1400kV, sensored, FOC-compatible)
• Hobbywing XERUN AXE R2 brushless ESC (80A continuous, 480A peak, built-in Bluetooth)
• Black 14-gauge input power cables with 200mm length (pre-attached to ESC)
• Motor sensor harness with sealed waterproof connector

What You Need to Complete

• 2S or 3S LiPo battery pack (7.4V or 11.1V nominal voltage) with XT-60 connector, or 6-9 cell NiMH battery pack
• Compatible 1/10 scale rock crawler chassis with 540-size motor mount
• RC radio system and receiver
• Servo(s) for steering control
• Battery charger compatible with your chosen battery chemistry
• Motor bullets (if not using XT-60 directly)
• Optional: Connector adapters (Deans, Traxxas, Tamiya, XT-90, EC5, Spektrum IC5, EC3) available from RC Model Shop at additional cost

Frequently Asked Questions

• What is FOC technology and why does it matter for RC crawlers? — FOC (Field-Oriented Control) is a revolutionary sensor technology that allows the ESC to have precise knowledge of motor position and speed at all times. This enables the motor and ESC to work together to maintain accurate RPM matching with your throttle input under all conditions, whether climbing uphill, descending downhill, or driving under heavy load. This level of control transforms crawler performance, particularly downhill where traditional systems struggle with jerky, uncontrolled braking. The FOC system also makes the motor extremely quiet, eliminating the annoying PWM noise from standard brushless crawlers.
• What is the 1400kV rating and what does it mean for performance? — The 1400kV rating indicates the motor's speed constant — how many revolutions per minute the motor will spin for every volt of battery voltage applied. A lower KV number like 1400kV means the motor produces maximum torque at lower speeds, making it ideal for rock crawlers where controlled low-speed power and excellent climbing ability are more important than top speed. This specification makes the 1400kV motor perfect for serious trail work, obstacle courses, and competitive rock crawling where precision and power are essential.
• Is this system suitable for beginners? — While the AXE540L R2 combo is an advanced system with sophisticated features, it's absolutely suitable for ambitious beginners who are committed to rock crawling and want to start with professional-grade equipment. The built-in Bluetooth programming via smartphone app is actually more user-friendly than traditional programming methods, and the intelligent torque control makes the system more forgiving and predictable than basic brushless crawlers. However, beginners should ensure they have experience with LiPo battery handling and basic crawler maintenance before choosing this high-performance system.
• What battery does this system need and what's the run time? — The AXE540L R2 requires either a 2-3S LiPo battery (7.4V or 11.1V nominal) or a 6-9 cell NiMH pack. A 3S LiPo (11.1V) will provide maximum performance and climbing power. Run times depend on your specific battery capacity, driving style and terrain, but the highly efficient FOC motor design and intelligent power management provide extended runtime compared to standard brushless crawlers. The system's low 1.7-amp no-load current means minimal battery drain when not under load.
• Is this waterproof and suitable for wet UK conditions? — Yes, absolutely. The system features IP-67 waterproof rating with completely sealed ESC design and robust heatsink case construction, combined with a fully sealed motor and innovative waterproof sensor harness with O-ring sealing. This means you can confidently operate the system in rain, through streams, and across muddy terrain without additional waterproofing steps. After use in harsh wet or muddy conditions, dismantle and clean the motor, applying lubricant to the bearings for optimal longevity.
• What Traxxas TRX-4 models are compatible with this system? — This system is compatible with numerous TRX-4 variants including the TRX-4 Chevrolet K10 Cheyenne High Trail Edition (all colours), TRX-4 Ford F-150 Ranger XLT High Trail Edition, TRX-4 1972 Chevrolet K5 Blazer High Trail Edition, TRX-4 1979 Chevy Blazer with Clipless body, TRX-4 Nissan Pathfinder SE-V6 3S, TRX-4 2021 Ford Bronco, TRX-4 Defender 4WD RTR, TRX-4 Sport models, and TRX-4 unassembled chassis kits.
• How do I programme and control this system? — The AXE540L R2 features built-in Bluetooth connectivity, allowing you to download the free Hobbywing HW Link V2 app (available for both Android and iOS) and programme the system directly from your smartphone. No external modules, programming boxes or additional hardware is required — simply connect via Bluetooth within the 3-metre effective range and adjust all settings through the intuitive mobile app interface.
• What makes the drag brake so effective? — The professional drag brake system in the AXE system can operate at 200% the power level of standard crawling brushless setups, providing exceptional hill-holding capacity and precise parking precision. Additionally, the drag brake is fully adjustable — you can set both the drag brake rate and how quickly it applies, allowing smooth high-speed driving without sudden jerks when releasing throttle on technical terrain.
• Does this system include a receiver or radio? — No, this combo includes only the ESC and motor. You will need to purchase a separate RC radio system and receiver compatible with your crawler chassis, along with steering servo(s) and battery pack to complete a functional system.
• What's the difference between this 1400kV model and the other AXE R2 options? — Hobbywing offers the AXE R2 in four different KV ratings: 1400kV, 2100kV, 2800kV and 3300kV. The 1400kV is the lowest KV option, providing maximum torque and slow-speed control ideal for extreme rock crawling. Higher KV versions (2100kV, 2800kV, 3300kV) provide progressively higher top speeds with correspondingly lower torque, making them suitable for different vehicle sizes and driving styles.

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 Hobbywing Black AXE540L R2 Sensored Brushless FOC Combo with 1400kV Motor and Built-in Bluetooth for 1/10 Crawlers – HW38020311 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.