Spec-class precision. Proven Hobbywing performance.
The Hobbywing XR10 Justock G3S ESC and SD G2.1 21.5T Motor Combo is engineered for competitive spec racing with fixed 0° timing and ultra-smooth throttle control. Perfect for 1/10 and 1/12 on-road or off-road vehicles, this combo delivers professional-level performance with the simplicity and reliability that make Hobbywing a racer favorite.
Designed for Stock Racing Excellence
With built-in polarity protection, integrated capacitor module, and RPM speed limiting, the XR10 Justock G3S is race-legal and ROAR-approved. The included SD G2.1 sensored motor delivers smooth, linear power and top-tier efficiency. Together, they offer a balance of speed, control, and durability ideal for both expert competitors and new drivers.
⚡ ESC Features:
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Built-in reverse polarity protection — no damage from reversed battery leads
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Programmable via OTA Wireless Module or 3-in-1 Program Box
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Internal capacitor module saves space and improves reliability
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RPM speed limit function with six selectable presets
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Fixed 0° timing — legal for spec class racing
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Adjustable BEC output (6V / 7.4V up to 8A)
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Data logging for post-run analysis
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Freewheeling mode lowers ESC temps and improves cornering feel
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Multiple safety protections: reverse polarity, low voltage, overheating, signal loss, locked rotor
🔩 Motor Features:
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21.5T sensored design with fixed timing
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High-efficiency windings and heat-resistant magnets
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Double-insulated wiring and precision bearings for reliability
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Sealed end bell with silicone O-ring dust protection
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Detachable design for easy cleaning and maintenance
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IFMAR and ROAR legal — ready for competition
📊 Specifications:
ESC:
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Continuous Current: 60A
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Burst Current: 380A
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Battery: 2S LiPo only
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BEC Output: 6V/7.4V @ 4A (switch-mode)
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Motor Limit: 10.5T or higher, 3650 size
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Application: 1/10–1/12 On-Road & Off-Road
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Size: 40.9 × 33.9 × 32.1 mm
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Weight: 75.4 g
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ROAR Approved
Motor:
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Turns: 21.5T
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KV Rating: 2050 KV
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Voltage: 2–3S LiPo
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No-Load Current: 3A
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Dimensions: Ø35.9 × 52.5 mm
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Shaft Diameter: 3.17 mm
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Weight: 175 g
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Fixed Timing (non-adjustable)
📦 Includes:
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(1) Hobbywing XR10 Justock G3S ESC
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(1) Hobbywing SD G2.1 21.5T Sensored Brushless Motor
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(1) 5V Cooling Fan
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(1) Sensor Cable
