HOBBYWING JUSTOCK G2.1 10.5T SENSORED MOTOR (FIXED TIMING) HW30408009

Overview

The Hobbywing XeRun JuStock 3650 G2.1 10.5T Sensored Motor represents the latest evolution in spec racing motor technology, delivering exceptional performance for competitive racers and enthusiasts alike across the UK and beyond. Following on from the success of the HobbyWing JuStock G2, this G2.1 variant features fixed timing and easy-to-use solder joints, making it an excellent choice for stock or sport class races where a controlled, predictable motor is essential. Whether you're competing in IFMAR or ROAR-sanctioned events, training for your next race, or simply looking for a reliable brushless motor for your 1/10th or 1/12th scale RC car, the JuStock G2.1 delivers the precision, durability and linear power delivery that serious racers demand.

This sensored brushless motor is engineered with competition-grade components and construction methods that ensure outstanding performance and exceptional durability even under the most demanding racing conditions. The combination of heat-resistant magnets, an aluminium case with advanced cooling design, double-insulated windings, high-precision Japanese bearings, and a robustly engineered rotor all work together to create a motor that performs consistently lap after lap. The built-in Hall sensor technology, combined with non-adjustable end bell design, guarantees smooth and linear power on demand — exactly what you need for precise throttle control during competitive racing or casual driving.

The JuStock G2.1 is perfectly matched with the XR10-Justock ESC for zero timing spec racing, though it remains fully compatible with other Hobbywing Electronic Speed Controllers and ESCs from other quality brands. It's an ideal choice for stock or sport class competition, but equally suitable for beginners and practice drivers looking to develop their skills on a proven, reliable platform. Available now in the UK, the Hobbywing JuStock G2.1 represents outstanding value for anyone serious about brushless RC car racing.

Key Features

• Heat-Resistant Magnet and Aluminium Case — The motor body uses a heat-resistant magnet attached to a precision aluminium case rather than iron, which not only provides a modern aesthetic appearance but significantly improves heat dissipation during extended running sessions, keeping the motor cooler and maintaining consistent performance throughout your race or practice day.
• Double-Insulated Windings — Premium double insulation on the motor windings provides enhanced electrical safety and durability, protecting against moisture and mechanical damage while ensuring reliable operation in various racing conditions.
• High-Precision Japanese Bearings — The front and rear bearings are manufactured to exacting standards (D9.525×D3.175×t3.967 each), delivering minimal friction and smooth rotor rotation, which translates directly to more efficient power delivery and better acceleration characteristics.
• Built-In Hall Sensor with Non-Adjustable End Bell — The integrated Hall sensor technology enables precise commutation timing and smooth linear power delivery, eliminating the need for external sensor modules. The non-adjustable end bell design ensures consistent performance straight out of the box without requiring tuning or calibration.
• Silicon O-Ring Seal for Heat Conduction and Dust Protection — A silicon O-ring seal is fitted between the end bell and stator, serving the dual purpose of conducting internal heat to the motor case for improved cooling whilst simultaneously preventing dust from entering the Hall sensor chamber, protecting against environmental contamination.
• Easy-to-Use Copper Solder Tabs — The motor features low-impedance copper solder tabs at the load end, allowing you to solder ESC wires directly for a solid, reliable connection with minimal resistance. This design simplifies wiring compared to traditional connectors and reduces potential connection issues during competition.
• Re-buildable Design for Easy Maintenance — The detachable end bell structure is engineered for straightforward removal, enabling daily cleaning and maintenance plus simple replacement of common wearing parts such as the rotor and sensor module, effectively prolonging the service life of your motor and improving long-term operating efficiency.
• Fixed Timing Configuration — The motor features fixed timing which is ideal for spec racing classes where adjustable timing is not permitted. This simplifies setup and ensures consistency across multiple motors if needed for practice or backup units.
• IFMAR and ROAR Compliance — The motor design fully complies with IFMAR and ROAR racing specifications, making it legal for use in sanctioned competition events at clubs and regional races throughout the UK and internationally.

Technical Performance

The JuStock 3650 G2.1 10.5T delivers impressive performance specifications that make it suitable for competitive racing across multiple vehicle types and scales. With a 4000KV rating and a no-load current draw of just 4.9 amps, this brushless motor is optimised for 2-3S LiPo battery configurations, providing excellent compatibility with standard racing power systems. The motor measures 35.9mm in diameter and 52.5mm in length with a 3.17mm shaft diameter, weighing 175 grammes — a compact and lightweight package that integrates seamlessly into 1/10th and 1/12th scale on-road and off-road RC racing vehicles including competition touring cars, drift cars, F1 models, mini cars, buggies, 2WD SCTs (Short Course Trucks), and various truck platforms. The two-pole sensored brushless design ensures smooth commutation and linear throttle response, critical characteristics for achieving consistent lap times and precise speed modulation during racing. The high-precision balanced rotor combined with the hall sensor technology delivers predictable acceleration curves and responsive deceleration, making the motor equally suitable for tight technical tracks requiring finesse and more open racing lines demanding aggressive power delivery. Built with Japanese-specification high-precision bearings and engineered for minimal internal friction, this motor represents a significant step forward in reliability and consistency compared to earlier generations. The aluminium case construction with its unique design not only looks modern and professional but provides measurably better thermal management than traditional iron cases, allowing the motor to maintain peak performance even during back-to-back heats or extended practice sessions. Whether you're preparing for a local club race, competing in regional championships, training for national events, or simply enjoying high-performance RC racing as a hobby, the JuStock G2.1 10.5T delivers the engineering quality and performance characteristics expected from Hobbywing's competition-focused product range.

What's in the Box

• Hobbywing XeRun JuStock 3650 G2.1 10.5T Sensored Brushless Motor with fixed timing

What You Need to Complete

• Compatible brushless ESC (Hobbywing XR10-Justock ESC recommended, or other Hobbywing/quality brand ESCs)
• Hall sensor connection cable (available in various lengths from Hobbywing)
• 2-3S LiPo battery pack
• Motor mounting hardware suitable for your vehicle platform
• Pinion gear and spur gear setup matched to your vehicle and desired performance characteristics

Frequently Asked Questions

• Is the Hobbywing JuStock G2.1 10.5T motor suitable for beginners? — Yes, absolutely. Whilst this is a competition-grade motor designed for spec racing classes, it's equally excellent for beginners and those learning to race. The smooth linear power delivery and fixed timing make it very forgiving and predictable, helping new drivers develop consistent throttle control without the complications of adjustable timing. Many RC shops across the UK recommend this motor as a practice platform for developing racing skills.
• What battery does the JuStock G2.1 10.5T motor need? — This motor is optimised for 2-3S LiPo battery packs. A 2S configuration provides slightly lower power for learning or lighter vehicles, whilst 3S delivers the full performance potential. Always use a quality brushless-compatible ESC to regulate power from your battery, and ensure your chosen ESC is rated for the current draw of 4.9 amps at no-load.
• How does the G2.1 differ from the original JuStock G2 motor? — The G2.1 features several significant improvements over the G1 and earlier G2 versions. The primary advances include fixed timing configuration (ideal for spec racing rules), easy-to-use copper solder tabs instead of connectors (simplifying wiring), an improved aluminium case for better cooling compared to the iron case of the G1, enhanced hall sensor integration, and the addition of the silicon O-ring seal that conducts heat whilst preventing dust entry into the sensor chamber. These refinements result in better cooling, easier maintenance, and more consistent performance.
• Is this motor compatible with ESCs from other manufacturers? — Yes, the JuStock G2.1 is designed with sensored brushless connectors and hall sensor technology that work with any quality brushless ESC, though Hobbywing's own XR10-Justock ESC is the perfect matched pairing for zero-timing spec racing. You can use it with other Hobbywing ESCs or ESCs from other reputable brands, but verify that your chosen ESC supports sensored operation and is rated for the motor's power characteristics.
• What types of RC cars can I use this motor in? — The JuStock G2.1 10.5T is suitable for a wide variety of 1/10th and 1/12th scale vehicles including on-road competition touring cars, drift cars, F1 models, and mini cars, plus off-road platforms such as buggies, 2WD short course trucks (SCTs), and various truck types. It's an excellent choice for stock or sport class racing in either on-road or off-road categories depending on which racing class you're entering.
• Is regular maintenance required for this motor? — The JuStock G2.1 features a re-buildable design with an easily removable end bell, making it simple to perform routine cleaning and maintenance. The silicon O-ring seal helps prevent dust from entering the hall sensor, reducing maintenance frequency. For competitive use, regular inspection and cleaning after each racing session is recommended best practice, and wearing parts such as bearings can be easily replaced without purchasing an entirely new motor.
• Does this motor come with a sensor cable? — The motor features built-in hall sensor capability, however you'll need to source an appropriate sensor cable (available separately in various lengths) to connect the motor to your ESC. Hobbywing offers multiple cable options (part numbers 30850100, 30810000, 30850102, 30850103 and others) to match your specific setup requirements.
• What makes the sensored design better than sensorless? — Sensored brushless motors like the JuStock G2.1 use hall sensor feedback to determine rotor position, enabling smooth commutation from a standstill and linear power delivery across the full throttle range. This results in more predictable acceleration, better low-speed torque characteristics, and improved overall controllability — essential advantages for competitive racing where precision matters.

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 JUSTOCK G2.1 10.5T SENSORED MOTOR (FIXED TIMING) HW30408009 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.