Hobbywing XERUN Justock Brushless Crawler Combo 21T


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Perfect Brushless Combo For All Our Trucks And Crawlers Sensored For Precise Low Speed Control


  • ALL the following ESC's & sensored motors have got ROAR approval!
  • Budget-friendly, high performance, best control feelings.
  • Timing is permanently set to zero degree (unchangeable) for SPEC race.
  • Very suitable for Rock Crawler when the ESC works with 21.5T sensored motor.


  • Low cost, high performance.
  • Small and light weight.
  • Drives sensored and sensorless brushless motors.
  • The internal timing is always zero degree to complaint with the rules of SPEC races such as ROAR SPORTMAN.
  • Multiple protection features: Low voltage cut-off protection / Over-heat protection / Throttle signal loss protection.
  • Plenty of programmable items.Via Setup Button
  • Easily programmed with the LED Program Box, Multifunction LCD Program Box and USB Link Software.(Available Separately)
  • ESC firmware can be updated through the USB adapter in the LCD Program Box.
  • Also suitable for rock crawler pro race when using "Crawler" working mode.


  • Output: Continuous current 45A, burst current 260A.
  • Input: 4-9 cells NiMH/NiCd or 2-3 cells LiPo. *Note1
  • BEC Output: 6V@2A linear mode built-in BEC.
  • Resistance: 0.0006 Ohm.
  • Motor Supported: Sensored brushless / Sensorless Brushless.
  • Suitable Brushless Motor:
    • With 2 cells Lipo or 4-6 cells NiMH, 1/10 on-road: >=8.5T, 1/10 off-road: >=11.5T
    • With 3 cells Lipo or 7-9 cells NiMH, 1/10 on-road: >=13.5T, 1/10 off-road: >=17.5T
  • Suitable Car:
    • 1/10, 1/12 on-road or off-road cars / trucks.
    • 1/10, 1/8 rock crawler.
  • Size: 33mm(L) * 28mm(W) * 31.5mm(H) (Cooling fan height included)
  • Weight: 59g (The weight of cooling fan not included)


*Note1: The cooling fan gets its power supply from built-in BEC. If 11.1v is used fan may be damaged advise high voltage fan be used.

  • JUSTOCK brushless ESC (1 pc)
  • 21.5T Sensored Brushless Motor (1 pc)
  • 5V Cooling Fan (1 pc)
  • Sensor Cable (1 pc)
  • Sticker (1 pc)
  • Manual (2 pcs)