Hobbywing Xerun Justock 21.5 Turn G2.1 – Brushless Sensor Motor for RC Hobby
The Hobbywing Xerun Justock 21.5 Turn G2.1 is a brushless DC motor with integrated sensor technology, designed specifically for RC crawlers and F1 models in 1:10 scale. The sensored commutation provides exceptionally fine torque control and high efficiency at low RPM.
Sensor technology for precise torque regulation – perfect for slow crawler sections and smooth acceleration on the track
21.5 Turns and 2050 kV no-load speed deliver the optimal balance of power and RPM for 1:10 chassis
35.9 mm outer diameter and 52.5 mm length housing fits standard motor mounts – easy installation
3.17 mm shaft with standard pinion compatibility for direct drive without adapters
24 months manufacturer warranty for long-term investment security
What sets the Xerun Justock G2.1 apart
The G2.1 generation improves sensor system responsiveness and reduces operating temperature compared to previous models. The motor is fully compatible with Xerun ESCs (e.g., Xerun XR10 Justock) and runs without bearings to minimise friction. The open housing design simplifies cleaning after outdoor use.
Ideal for...
The Justock 21.5 Turn targets beginners and ambitious hobby racers seeking a reliable, regulation-compliant motor for competitions such as ROAR or IFMAR. With sensored control, it performs equally well on technical crawler courses and fast F1 laps on asphalt.
How to use the Xerun Justock G2.1
Connect the three motor phases to the ESC (colour-coded wires: A, B, C). Plug the sensor cable (6-pin connector) into the corresponding port on the ESC – fine control becomes active. Mount the motor in the motor mount using the supplied screws and slide a pinion (32 DP / 0.6 module) onto the shaft. Ensure proper gear mesh and apply threadlock to the pinion set screw.
Hobbywing is a renowned manufacturer of brushless motors and ESCs for RC hobby. The Xerun series delivers powerful and reliable drivetrains for competition and leisure. With sensored technology, Hobbywing motors offer precise torque control and high efficiency.
It is a brushless DC motor with sensors for RC vehicles. The 21.5 Turns provide moderate speed with high torque, ideal for 1:10 scale crawlers and F1 models.
Specifically for RC crawlers and F1 cars in 1:10 scale. Thanks to the sensored control, it also suits other applications requiring fine throttle response.
Outer diameter 35.9 mm, length 52.5 mm, shaft diameter 3.17 mm, no-load speed 2050 kV, weight 230 g. Motor type: Brushless sensored.
Yes, the motor has a 6-pin sensor connector and must be connected to a compatible sensored ESC (e.g., Hobbywing Xerun XR10 Justock). The cable is not included but is commercially available.
Hobbywing provides 24 months manufacturer warranty on material and workmanship defects. Warranty voids with improper installation or overloading.
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