{"product_id":"hobbywing-xerun-justock-g2-1-21-5t-2050kv-rc-motor-black-hw30408012","title":"Hobbywing XeRun Justock G2.1 21.5T 2050KV RC Motor Black HW30408012","description":"\u003cp\u003eThe Hobbywing XeRun Justock 3650 SD G2.1 21.5T is a fixed-timing sensored brushless motor designed for 1\/10 and 1\/12 scale RC stock and sport racing. With a 2050KV rating, two-pole rotor and non-adjustable timing, it delivers smooth, consistent power for drivers seeking precise throttle control and a dependable racing setup. Its aluminium housing, precision bearings and serviceable construction also make it suitable for compatible RC crawlers and recreational models.\u003c\/p\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eFixed Timing for Spec Racing: Non-adjustable motor timing provides a consistent configuration for racing classes that permit this motor.\u003c\/li\u003e\n\u003cli\u003e21.5T Sensored Brushless Design: Combines a 21.5-turn winding with a 2050KV rating for controlled power delivery.\u003c\/li\u003e\n\u003cli\u003ePrecision Hall Sensor: Built-in rotor position sensing supports smooth startup, linear throttle response and precise low-speed control.\u003c\/li\u003e\n\u003cli\u003eTwo-Pole Rotor: Designed for efficient operation in compatible 1\/10 and 1\/12 scale RC applications.\u003c\/li\u003e\n\u003cli\u003eDurable Internal Construction: Heat-resistant magnet, double-insulated windings and precision bearings support reliable performance.\u003c\/li\u003e\n\u003cli\u003eAluminium Motor Housing: Helps dissipate heat during operation while providing a durable motor case.\u003c\/li\u003e\n\u003cli\u003eSilicone O-Ring Seal: Seal between the end bell and stator helps transfer heat to the housing and protect the Hall sensor from dust.\u003c\/li\u003e\n\u003cli\u003eServiceable Design: Removable end bell allows access for cleaning, inspection and replacement of serviceable components.\u003c\/li\u003e\n\u003cli\u003eCopper Solder Tabs: Three low-impedance terminals allow secure connection of ESC motor wires.\u003c\/li\u003e\n\u003cli\u003e2S–3S LiPo Motor Rating: Supports suitable 2S or 3S LiPo setups when used with a compatible ESC and vehicle configuration.\u003c\/li\u003e\n\u003cli\u003eHobbywing XR10 Justock Compatibility: Designed to pair with suitable XR10 Justock ESCs for zero-timing racing setups.\u003c\/li\u003e\n\u003cli\u003eVersatile RC Applications: Suitable for selected touring cars, F1 cars, buggies, short course trucks and rock crawlers where the motor specifications are appropriate.\u003c\/li\u003e\n\u003cli\u003eStock Racing Focus: Designed around established stock motor specifications, with event eligibility dependent on current class rules.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eBrand: Hobbywing\u003c\/li\u003e\n\u003cli\u003eProduct Range: XeRun Justock\u003c\/li\u003e\n\u003cli\u003eModel: 3650 SD G2.1 21.5T\u003c\/li\u003e\n\u003cli\u003eManufacturer Part Number: 30408012\u003c\/li\u003e\n\u003cli\u003eSKU: HW30408012\u003c\/li\u003e\n\u003cli\u003eBarcode: 6938994419246\u003c\/li\u003e\n\u003cli\u003eProduct Type: Sensored Brushless RC Motor\u003c\/li\u003e\n\u003cli\u003eColour: Black\u003c\/li\u003e\n\u003cli\u003eMotor Size: 3650 \/ 540-Class\u003c\/li\u003e\n\u003cli\u003eRecommended Vehicle Scale: 1\/10 and 1\/12\u003c\/li\u003e\n\u003cli\u003eMotor Type: Brushless\u003c\/li\u003e\n\u003cli\u003eSensor Type: Sensored\u003c\/li\u003e\n\u003cli\u003eMotor Turns: 21.5T\u003c\/li\u003e\n\u003cli\u003eKV Rating: 2050KV\u003c\/li\u003e\n\u003cli\u003ePole Count: 2\u003c\/li\u003e\n\u003cli\u003eTiming: Fixed, Non-Adjustable\u003c\/li\u003e\n\u003cli\u003eSupported Battery: 2S–3S LiPo with Compatible ESC\u003c\/li\u003e\n\u003cli\u003eInternal Resistance: 0.070 Ohm\u003c\/li\u003e\n\u003cli\u003eNo-Load Current: 3.0A\u003c\/li\u003e\n\u003cli\u003eMaximum Output Power: 115W\u003c\/li\u003e\n\u003cli\u003eCurrent at Maximum Output Power: 35A\u003c\/li\u003e\n\u003cli\u003eMotor Diameter: 35.9mm\u003c\/li\u003e\n\u003cli\u003eMotor Length: 52.5mm\u003c\/li\u003e\n\u003cli\u003eOutput Shaft Diameter: 3.17mm\u003c\/li\u003e\n\u003cli\u003eOutput Shaft Extension: 15mm\u003c\/li\u003e\n\u003cli\u003eWeight: Approximately 175g\u003c\/li\u003e\n\u003cli\u003eFront Bearing: 9.525 x 3.175 x 3.967mm\u003c\/li\u003e\n\u003cli\u003eRear Bearing: 9.525 x 3.175 x 3.967mm\u003c\/li\u003e\n\u003cli\u003eMotor Power Connections: Three Copper Solder Tabs\u003c\/li\u003e\n\u003cli\u003ePrimary Applications: Compatible Stock and Sport Class RC Racing\u003c\/li\u003e\n\u003cli\u003eAdditional Applications: Compatible RC Rock Crawlers and Recreational Vehicles\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eIncludes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1 x Hobbywing XeRun Justock 3650 SD G2.1 21.5T Sensored Brushless Motor\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eIs the Hobbywing Justock G2.1 21.5T motor suitable for stock racing?\u003c\/strong\u003e Yes. It is designed as a fixed-timing motor for stock and sport racing applications. However, approved motor lists, winding limits, rotor specifications and ESC timing rules vary between events. Check the current regulations for your racing class before entering.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the KV rating of the Justock G2.1 21.5T?\u003c\/strong\u003e The 21.5T version is rated at 2050KV. It is a two-pole sensored brushless motor with fixed timing.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan this motor run on a 3S LiPo battery?\u003c\/strong\u003e Hobbywing rates the motor for 2S–3S LiPo operation. However, many stock racing classes specify 2S only, and the ESC must support the selected battery voltage. Check your ESC, gearing and competition rules before using 3S.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhich ESC works with the Justock G2.1 21.5T?\u003c\/strong\u003e The motor is designed to work with compatible sensored brushless ESCs, including suitable Hobbywing XR10 Justock models. For sensored operation, use the correct sensor connection and ensure the ESC supports the motor and battery configuration.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs the motor timing adjustable?\u003c\/strong\u003e No. The Justock G2.1 has a fixed-timing design with a non-adjustable end bell. This is a key distinction from adjustable-timing brushless racing motors.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan the 21.5T Justock motor be used in a rock crawler?\u003c\/strong\u003e Yes. Hobbywing identifies the 21.5T and 25.5T Justock G2.1 versions as suitable for compatible rock crawler applications. Check motor size, gear reduction, ESC compatibility and expected running loads before installation.\u003c\/p\u003e\n\u003ch3\u003eImportant Notes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eThis product is the standalone 21.5T motor, not an ESC and motor combo.\u003c\/li\u003e\n\u003cli\u003eMotor timing is fixed and cannot be adjusted through the end bell.\u003c\/li\u003e\n\u003cli\u003eCompetition eligibility depends on the current regulations and approved equipment lists for the relevant event.\u003c\/li\u003e\n\u003cli\u003eAlthough the motor supports 2S–3S LiPo, the connected ESC and racing regulations may impose a lower voltage limit.\u003c\/li\u003e\n\u003cli\u003eRequires a compatible brushless ESC, suitable sensor connection and motor wiring.\u003c\/li\u003e\n\u003cli\u003eThe 3.17mm output shaft requires a compatible pinion gear with the correct bore and gear pitch.\u003c\/li\u003e\n\u003cli\u003eMotor wires connect to copper solder tabs; ready-fitted bullet connectors are not guaranteed.\u003c\/li\u003e\n\u003cli\u003eCheck motor temperature and gearing after installation, particularly when using higher battery voltage or heavier vehicles.\u003c\/li\u003e\n\u003cli\u003eDo not assume the motor is waterproof. Protect it from excessive water, dirt and contamination.\u003c\/li\u003e\n\u003cli\u003eESC, battery, motor pinion, tools and RC vehicle are not included.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Hobbywing","offers":[{"title":"Default Title","offer_id":53720061772088,"sku":"HW30408012","price":134.95,"currency_code":"AUD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0738\/2849\/9768\/files\/Hobbywing_XeRun_Justock_G2.1_21.5T_2050KV_RC_Motor_Black_HW30408012.png?v=1793672473","url":"https:\/\/ozrc.com.au\/products\/hobbywing-xerun-justock-g2-1-21-5t-2050kv-rc-motor-black-hw30408012","provider":"OZRC","version":"1.0","type":"link"}