Hobbywing Xerun Justock 21.5 — Brushless Sensored Motor for High-Precision RC Applications
The Hobbywing Xerun Justock 21.5 is a brushless sensored DC motor designed for RC vehicles and models requiring precise speed control and consistent torque delivery. With a 2100 kV rating and a 3.175 mm shaft diameter, it offers a compact, high-performance drivetrain solution for hobby-grade builds.
2100 kV sensorless-ready motor delivers responsive speed control across a wide voltage range
36 mm outer diameter and 48.5 mm length provide a compact fit in tight RC chassis layouts
Brushless sensored design ensures smooth low-speed operation and reliable commutation
3.175 mm shaft diameter accepts standard RC propeller and wheel hubs without adapters
Das zeichnet den Hobbywing Xerun Justock 21.5 aus
Unlike brushed alternatives, the Xerun Justock 21.5 eliminates brush friction and electromagnetic interference, extending operational life and reducing maintenance intervals. The sensored commutation feedback enables precise speed regulation at low RPM — critical for crawling and precision driving scenarios where timing matters.
Ideal für...
RC hobbyists building or upgrading on-road and off-road vehicles that demand a compact, high-RPM brushless motor with sensor feedback. Suitable for 1/10 and 1/12 scale touring cars, buggies, and crawlers where space constraints and consistent power delivery are priorities.
Anwendung von Hobbywing Xerun Justock 21.5
Mount the motor to the RC chassis using the standard 3.175 mm shaft mounting pattern
Connect the three phase wires and sensor leads to a compatible Hobbywing or third-party ESC
Verify rotation direction and sensor signal integrity before running
Adjust ESC timing and throttle endpoints to match the 2100 kV rating and vehicle weight
Hobbywing is a Shenzhen-based manufacturer specializing in RC electronic speed controls, brushless motors, and power systems for hobby-grade models. The Xerun Justock line targets the mid-range RC market with sensor-equipped brushless motors that balance cost efficiency with reliable performance. Products are distributed through European hobby retailers and online shops.
It is a brushless sensored DC motor for RC vehicles, providing precise speed control and high RPM for on-road and off-road models.
The motor requires a brushless ESC with sensor input support. Hobbywing ESCs and most third-party 1/10 scale brushless ESCs with a 3.175 mm shaft output are compatible.
Outer diameter 36 mm, length 48.5 mm, shaft diameter 3.175 mm, 2100 kV, brushless sensored, weight 0.17 kg.
Yes, the sensored version includes a sensor lead for commutation feedback to the ESC. The three phase wires and sensor connector are standard Hobbywing pinout.
24 months manufacturer warranty from date of purchase. Register the product on the Hobbywing website to activate the warranty.
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