HobbyStar 550 4-Pole Brushless Sensorless Motor, 5.0mm Shaft

SKU: 375-05-CNF

Availability: In stock


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The HobbyStar 550 4-pole brushless, sensorless motor is based on the same design as our powerhouse 540 sensorless motor, but features a longer 550 sized can for extra torque. The perfect motor when a high-torque, high-performance powerplant is required such as 4x4 short-course trucks.  A beautifully machined T6 billet-aluminum housing contains a 4-pole, 12-slot high-torque rotor spinning on High-RPM ABEC5 oversized bearings for a powerful, reliable motor choice for your 1/10 scale vehicle.  Comes with motor leads with 4.0mm bullet connectors already installed. Available in a wide variety of KV ratings.



  • 4-pole 12-slot high-torque design
  • CNC machined 6061 T6 billet aluminum can
  • High-purity copper windings maximize efficiency
  • High-RPM ABEC5 oversized bearings
  • Precision balanced rotor for smooth operation and maximum RPM
  • Super-thin (0.2mm) stator laminations 
  • Removable/replaceable rotor
  • Precision Engineered for maximum energy conversion


Product KV (RPM/Volt) Max Voltage Max Amps Rotor Poles IO Resistance Watts Max RPM Length (mm) Diameter (mm) Weight (g) Shaft Diameter (mm) Shaft Length (mm) Connectors
550/2Y 3500 3S 85A 4 2.5A 0.0089 1200W 50,000 55 36 195 5 17 4.0mm gold
550/3.5T 3800 2S 92A 4 2.8A 0.0083 1200W 50,000 55 36 195 5 17 4.0mm gold
550/3T 4300 2S 100A 4 3.7A 0.0058 1200W 50,000 55 36 195 5 17 4.0mm gold


Customer Reviews (3)

Great motorReview by Michael
Running the 3800kv on 3S (not recommended)
On both a SC and MT and it's stupid fast
Motor doesn't overheat as long as you don't run steady at high speed
Very happy (Posted on 5/14/2017)
Great motorReview by Johnny B.
Very pleased with this motor. Running the 3500kv in my slash 2wd with 3s and geared properly it runs cool all day. Insane power for the price and you can't beat the awesome customer service. (Posted on 5/27/2016)
Awesome!!Review by Duke's Kustom RC's
I put this 3500kv in my Terremoto 10 to replace the stock 3000kv 2 pole motor and what a difference. The truck on 3S is insane, so fast and plenty of power. I managed to rip the tire off the wheel from speed. (Posted on 1/15/2016)

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