HobbyStar 550 4-Pole Brushless Sensorless Motor, 3.2mm Shaft

HobbyStar 550 4-Pole Brushless Sensorless Motor, 3.2mm Shaft

SKU: 375-04-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 combines a longer 550 sized and a 5mm shaft for a bulletproof design. 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
550/3.5Y 1950 3S 46A 4 1.2A 0.0231 1200W 50,000 55 36 195 3.2 17 4.0mm gold
550/5T 2600 3S 63A 4 1.5A 0.0146 1200W 50,000 55 36 195 3.2 17 4.0mm gold
550/2Y 3500 3S 85A 4 2.5A 0.0089 1200W 50,000 55 36 195 3.2 17 4.0mm gold
550/3.5T 3800 2S 92A 4 2.8A 0.0083 1200W 50,000 55 36 195 3.2 17 4.0mm gold
550/3T 4300 2S 100A 4 3.7A 0.0058 1200W 50,000 55 36 195 3.2 17 4.0mm gold


Customer Reviews (2)

Best budget motor aroundReview by Michael
There isn't a better quality motor I've used for the price. I have the 3900kv variant. It is almost as powerful as the much more expensive motor it replaced. Runs about the same temperature, about the same top speed with I'd say about 85% of the torque. Still enough to lift the front end of a Stampede 4x4 however. For less than half the price I have no complaints. (Posted on 9/27/2016)
Great motor for the moneyReview by
Very glad I bought this motor, tons of torque, very great value, would highly recommend this thing, would for sure buy another (Posted on 11/21/2015)

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how long are the motor leads?
right at 10 inches from where they exit the can to the tip of the bullets.
RCJuice answered on January 13, 2020

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