This is the Hobbywing XeRun V10 G3R 21.5T Sensored Brushless Motor. Design matters. It’s a motor specially designed for Extremely High-Level Racing. The RMP of G3 Stock motor is significantly improved, the KV & torque are improved by 16% and 4% respectively, compared with the V10 G2 Stock motor.

• Improved Power & RPM
  The optimized stator structure combined with the super magnetic rotor improves the G3R Stock motor’s
  torque by 13.3%, KV value by 6.5% and maximum output power by 8.6% when compared to the V10
  G3 Stock motor. The high torque, RPM and power make it a “secret weapon” for the Stock class racing.
• Low Resistance but High Efficiency
  Its resistance is reduced by 11% but the efficiency is improved by 6% when compared to the V10 G3 Stock motor.
  The super high efficiency significantly slow down the temperature increase.
• Super Lightweight
  The G3R Stock weighs only 139g and is 8.6% lighter than some
  popular Stock motors (that weigh 152g) on the market. The light-weight
  motor allows drivers to easily control the balance of their RC vehicles.
• Great Heat Dissipation
  The special shell design which makes the stator core (/laminations)
  expose to the air will maximize cooling, the big holes on the front &
  rear end plates will guarantee outstanding heat dissipation.
• Re-buildable Structure
  The detachable structure design for regular cleaning & maintenance will effectively prolong the service life of the motor and retain its efficiency.
• Stock & Optional Rotors
  The stock super magnetic rotor(PN: 30820411) for 13.5-21.5T motor is applicable to the Blinky stock racing. Change optional titanium shaft weak magnetic rotor (PN30820416) is applicable to BOOST Stock variable angle racing, with higher power output and lower temperature of motor.
• High-quality Components
  The use of high-performance stator core (/laminations), heat(200℃)-resistant pure copper wire, heat(180℃)-resistant rotor with strong structure, world-class high precision and high strength bearings, and copper solder tabs with super current endurance will guarantee excellent performance and great durability.

• T: 21.5
• KV (no load): 2300
• Current No-load（A）: 2.7
• Max. Output Power（W）: 137
• C.at the point of M.O.P *(A): 32
• LiPo(S): 2-3
• W (g): 139g
• Applicable: 1/10th Stock Class Racing, Rock Crawler