HOBBYWING XERUN V10 21.5T G4R BLACK MOTOR HW30401747

Overview

The Hobbywing XERUN V10 21.5T G4R Black Motor is a premium brushless racing motor designed specifically for 1/10 scale stock class RC car competition. This is a high-performance upgrade motor for serious racers and enthusiasts in the UK RC car scene who demand maximum efficiency, reliability and speed from their electric power system. Whether you're competing in sanctioned stock class races or pushing your 1/10 RC car to its limits, the XERUN V10 G4R delivers measurable performance gains that make a real difference on the track.

Hobbywing has completely redesigned their G4R motor platform with a focus on thermal management, efficiency and durability. Compared to comparable competitive motors, this 21.5T brushless motor offers up to 7% more speed and 9% higher overall performance. Even when compared to its G4 predecessor, the G4R achieves a 4% performance improvement, making it an exciting choice for drivers looking to gain that extra competitive edge in stock racing. The motor's exceptional design ensures it can be pushed hard lap after lap without performance degradation or reliability concerns.

If you're shopping for a brushless RC motor UK retailers recommend for serious 1/10 stock class competition, the XERUN V10 G4R represents the cutting edge of motor technology. Its optimised cooling system, advanced winding design and premium materials make it worthy of trust in the most demanding racing environments.

Key Features

• Advanced G4R Stator and Winding Design — The completely redesigned stator and winding geometry reduces overall internal resistance while maintaining full compliance with sanctioning specification class rules. This means you get improved efficiency without sacrificing legality in competition.
• Optimised Cooling Through Open Core Can Design — The motor features an open core can and all-new rotor design that allows the heat generated by the stator to be directly cooled by airflow. The can and rotor design work together to maximise airflow through the motor, which is critical for maintaining consistent internal resistance and preventing thermal shutdown during intense racing.
• Ultra-High Temperature Wiring — The G4R uses the highest temperature-rated wiring available to date, with temperature resistance up to 40 degrees Celsius higher than competing brands. The internal wiring can withstand temperatures up to 220°C, allowing you to push the motor to its absolute limits and keep it coming back for more without degradation.
• Nylon Mixed Shims for Quiet Operation — Updated nylon mixed shims provide exceptionally quiet motor operation whilst also increasing wear resistance by approximately 2 times compared to previous designs. This means longer service life, reduced noise during practice and racing, and sustained performance consistency over many racing seasons.
• Improved Rotor and Gasket Design — The completely new rotor works in conjunction with upgraded gasket materials that have approximately 2 times the wear resistance of previous versions. This extends the service life of the motor and ensures consistent performance lap after lap, race after race.
• Dual Sensor Ports for Flexible Installation — The G4R features dual sensor ports, giving racers complete freedom in how they route their sensor wires through their chassis. The unused port is protected by an included silicon port plug, keeping your motor clean and protected from debris.
• Modular Design for Easy Maintenance — The sleek, simple modular design makes regular service and cleaning straightforward and direct. Cleaner motors last longer and run more efficiently, so the ability to quickly disassemble and maintain your motor is essential for consistency during a race season.
• 3% Lower Internal Resistance Than G4 Predecessor — The improved motor efficiency compared to the G4 results in reduced temperature rise and more consistent internal resistance numbers throughout long racing sessions. This directly translates to more predictable handling characteristics and better lap-to-lap consistency.
• Sensored/Sensorless Capability — This motor is compatible with both sensored and sensorless ESC systems, giving you flexibility in your equipment choices and allowing you to upgrade or change your electronic speed controller without being locked into a specific setup.
• 2-Pole Design for Stock Class Racing — The 2-pole configuration is purpose-built for 1/10 stock class racing applications, ensuring the motor meets specification class requirements whilst delivering the performance gains serious competitors demand.

Technical Performance

The XERUN V10 21.5T G4R is engineered to the highest standards using premium materials and advanced manufacturing techniques. This brushless motor is rated for 2-3S LiPo batteries with a no-load current of 5.4A (297W), making it suitable for both 2S and 3S battery configurations depending on your specific race class regulations. The motor features a compact 540 size form factor with an outer diameter of 35.8mm and length of 51.3mm, allowing it to fit standard 1/10 motor mounts. The lightweight construction at just 152 grams helps keep rotating mass to a minimum, reducing inertia and improving acceleration response. The motor uses a 3.175mm shaft diameter (3.2mm bore) which is the standard size for 1/10 scale RC cars, and employs high-quality ball bearings (D9×D4×t4 front and D8×D3×t4 rear) that are precision-manufactured for smooth, consistent operation. The adjustable mechanical timing range of 20° to 60° allows fine-tuning to match your specific ESC, battery and driving style for optimised performance. All internal components are manufactured to tight tolerances from the finest materials available, ensuring durability even under the extreme demands of competitive racing where motors are run at peak performance for extended periods.

What's in the Box

• Hobbywing XERUN V10 21.5T G4R brushless motor
• Silicon sensor port plug (for unused sensor port)

What You Need to Complete

• Brushless ESC (electronic speed controller) compatible with brushless sensored or sensorless motors
• 2S or 3S LiPo battery (depending on your racing class regulations)
• LiPo battery charger
• Motor pinion (gear) — size depends on your desired gearing
• RC car chassis with 1/10 motor mount
• Radio system and servo (if not already part of your car)

Frequently Asked Questions

• Is the XERUN V10 21.5T G4R suitable for 1/10 stock class racing? — Yes, this motor is specifically designed for 1/10 stock class racing competition. The G4R stator and winding design maintains full compliance with sanctioning specification class rules whilst delivering measurable performance improvements over comparable motors and the previous G4 generation.
• What is the performance improvement of the G4R compared to previous Hobbywing motors? — Compared to the G4 predecessor, the G4R delivers a 4% increase in overall performance. Compared to other brands' comparable motors, you can expect up to 7% more speed and 9% higher overall performance, making this an excellent choice for competitive drivers.
• What battery configuration does this motor require? — The XERUN V10 21.5T G4R is rated for 2-3S LiPo battery packs. Your specific choice between 2S and 3S depends on your racing class regulations and desired power delivery characteristics. Always consult your local racing class rules before selecting battery voltage.
• Will this motor work with both sensored and sensorless ESCs? — Yes, the G4R is compatible with both sensored and sensorless electronic speed controllers, giving you flexibility in your equipment choices and allowing you to use whichever ESC type your class regulations permit or your budget allows.
• How does the cooling system work on the G4R? — The motor features an open core can design combined with an all-new rotor that allows heat generated by the stator to be directly cooled by airflow. The can and rotor design work together to maximise airflow through the motor, ensuring efficient heat dissipation during intense racing sessions. This is critical for maintaining consistent performance and preventing thermal shutdown.
• What is the internal resistance reduction compared to the G4? — The G4R achieves approximately 3% lower internal resistance than the G4 predecessor, resulting in improved efficiency, reduced temperature rise and more consistent performance numbers throughout extended racing sessions.
• Can I adjust the motor's timing? — Yes, the XERUN V10 21.5T G4R features adjustable mechanical timing with a range of 20° to 60°. This allows you to fine-tune the motor's performance characteristics to match your specific ESC, battery configuration and personal driving style for optimised results.
• How durable is the G4R motor for racing use? — The G4R is engineered for durability in competitive racing environments. The wiring can withstand temperatures up to 220°C (up to 40°C higher than competing brands), the gasket wear resistance has been increased by approximately 2 times, and the nylon shims provide long-lasting consistency. These improvements mean the motor can be pushed hard continuously without degradation.
• What makes the dual sensor ports useful? — The G4R features dual sensor ports giving you complete flexibility in how you route your sensor wires through your chassis for the cleanest, most organised installation. The unused sensor port is protected by an included silicon plug to keep your motor clean.
• Is this motor easy to maintain? — Yes, the G4R uses a sleek, simple modular design that makes regular service and cleaning straightforward and direct. Cleaner motors last longer and run more efficiently, so the ability to quickly disassemble and maintain your motor is essential for race season consistency.

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 XERUN V10 21.5T G4R BLACK MOTOR HW30401747 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.