Hobbywing Xerun V10-21.5T Black G4R Roar Brushless Stock MotorThe new G4R stator and winding design reduces the overall internal resistance, while maintaining the requirements for sanctioning spec class rules.The improved motor efficiency reduces the temperature rise to keep internal resistance numbers consistent. The motor adopts an open core can, and uses an all new Rotor. This allows the heat generated by the stator to be directly cooled by airflow. The can and rotor design allows airflow through the motor tomaximize the cooling.Updated nylon mixed shims provide ultra quiet motor operation and provide long lasting consistency.The wear resistance of the gasket is increased by approximately 2 times.G4R motor windings use the highest temperature rated wiring to date. This allows further resistance to heat, while increasing the overall motor efficiency.Compared to other brands, temperature resistance is up to 40 degrees C higher. Resistance to high temperature damage means the motor can be pushed to its limits and come back for more.The G4R features dual sensor ports providing racers with options for sensor wire routing. The unused port is protected by the included silicon port plug. The G4R uses a sleek and simple modular design. This makes regular service and cleaning simple and direct. Cleaner motors last longer and run more efficiently. FeaturesExcellent performance, specially designed for 1/10 -1/12 STOCK racing. Designed to pair with HOBBYWING XR10 Stock Spec G2 ESCThe innovative outer diameter structure of fully exposed stator core maximizes the heat dissipation area and the rear end of the motor is a big opening structure to further improve the heat dissipation effect.Dual sensor interface design to meet various wiring/layout requirements.The special copper bar is customized and the spacing of copper bar is widened, which greatly facilitates the operation of soldering wire.The built-in high precision Hall sensor combined with the high precision and balanced rotor guarantee outstanding linearity of the motor.The use of high-performance stator core, 220°C high-temperature-resistant enameled wire, high precision and high strength bearings, and copper solder tabs with super current endurance guarantees outstanding.Applications1/10th & 1/12th STOCK Class Racing Product SpecificationsScale - 1/10thBrushed/Brushless - BLSensored/Sensorless - SDPole Count - 2Relevant ParametersLiPo Cells - 1-3SSize & WeightO.D.(mm) - 35.8Length (mm) - 51.3Shaft Diameter (mm) - 3.175Weight (g) - 152Front Bearing - D9*D4*t4Rear Bearing - D8*D3*t4g