Tekin Gen4 Spec-R Sensored Brushless Motor (17.5T)

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Tekin Gen4 Spec-R Sensored Brushless Motor (17.5T)
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Price: $109.99

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The Tekin Gen4 Spec-R Sensored Brushless Motor has been engineered for performance. Utilizing the best materials available the SPEC-R has been redesigned to cut weight and reduce resistance, resulting in a purebred Spec racing machine. On Road or Off, the SPEC-R handles all disciplines, providing smooth power and control across the full RPM range. The SPEC-R is competition performance with the speed you need to win. 

The GEN4 motor line features a redesigned, precision stamped and pressed stator to increase efficiency and reduce resistance. The stators are hand-wound with high purity copper wire and machined from 6061-T6 aluminum. The motors can be tuned with optional rotors and are re-buildable, making the GEN4 SPEC-R motor a premium performance power plant designed for the serious racer.


  • 60 Degrees Adjustable Timing Advance
  • SPEC Racing Specific Design
  • CNC Machined 6061-T6 Billet Aluminum Heat Sink Can
  • ?Neodymium Sintered Magnet
  • Precision Engineered for Maximum Energy Conversion
  • High Purity Copper Windings Maximize Conductivity
  • Low Resistance, High Power Solder Tabs
  • Sensored System Ready
  • Anodized End-bell Plates Maximize Corrosion and Wear Resistance
  • High RPM Precision Bearings
  • Oversized Front Bearing
  • Rebuild-able Design
  • Solder-less Sensor PCB Replacement
  • Legal in Major Race Governing Bodies
  • ROAR Approved 

Input Voltage: 1-2S LiPO - 25.5T / 21.5T / 17.5T / 13.5T / 10.5T / 6.5T
Weight: 5.1oz / 145g
Shaft Dimensions: 3.18mm (1/8") x 15.3mm
Motor Diameter: 35.85mm / 1.40"
Motor Length: 50.25mm / 1.978"
Max Operating Temperature: 180°F / 82°C
Bearing Dimensions: Front: 4x13x5mm; Rear: 1/8x3/8x5/32"
Rotor Size: 12.3mm BLACK - 25.5T; 12.5mm BLUE - 21.5T / 17.5T / 13.5T / 10.5T
Rebuildable: Yes

This product was added to our catalog on July 1, 2020

Sean Maggard
Verified Owner
Sunday, Oct 22 2023 (6 weeks ago)
Tekin Gen4 Spec-R Sensored Brushless Motor (17.5T)
Hate this motor, already going back to Tekin for repairs after only 6 weeks in a 1/10th pan car
Austin Strang
Verified Owner
Wednesday, Feb 15 2023 (10 months ago)
Tekin Gen4 Spec-R Sensored Brushless Motor (17.5T)
I went out to my local off-road track with a Just Stock system and was so far off the pace that I know I needed to do something. I had a gen 3 ESC laying around so I bought the motor. And boy oh boy was this the right motor for the job. My 22 5.0 was just killing it when it came to speed this last time out. I haven't touched timing on it and I'm running recommend gearing. Motor stays cool looks great and just has amazing power.
Matthew Bayless
Verified Owner
Wednesday, Nov 30 2022 (about a year ago)
Tekin Gen4 Spec-R Sensored Brushless Motor (17.5T)
Motor was bad out of the box. The senor board was bad and Amain wouldn't swap it out very discouraging that Amain wanted me to send it to tekin for their warranty and wait 45 days to get a motor. Instead of taking care of it in house when I offered a ship it back to him and then trade me out they wouldn't do it. Motor never even saw the track.