MRR Short Stack Competition Sensored Brushless Motor (17.5T) by Maclan

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The Maclan Racing MRR Short Stack Competition Sensored Brushless Motors are well suited for any stock spec class in RC car racing. Featuring the latest hall sensor technology and highest grade copper wires, the MRR Short Stacks are a no compromise stock racing motor option.


  • The latest hall sensor technology that precisely deliver all the RPM and torque to you.
  • Short stator design for the lowest internal resistance and maximum performance (13.5/17.5/21.5)
  • Highest grade copper wires provide maximum conductivity with no compromise.
  • Heavy duty concave shape soldering tabs minimize the resistance and easy soldering work.
  • CNC 6061 T6 full aluminum case with maximum venting design for optimized durability and airflow cooling
  • Rebuild-able structure allows easy maintenance.
  • ROAR Approved
  • Includes 200mm Sensor Wire

Turn: 17.5
Case Length:
Case Diameter: 1.42in/36mm
Shaft Extension: 0.552in/14mm
Shaft Size: 3.17mm
Weight: 6oz/170g ±2g
Poles: 2 Poles
Max Voltage: 3S Li-Po (10.5T ~25.5T)
Short Stack Design: Yes
Stock Class Default Rotors: 10.5T~21.5T MCL4076 12.5mm Torque Spec Rotor

This product was added to our catalog on March 4, 2016.

Tuesday, Sep 13 2016 (5 weeks ago)
Maclan MRR Short Stack Competition Sensored Brushless Motor (17.5T)
I got a chance to spend some time dialing in this motor for our local on-road track in Florida, in my 1/10th "Blinky" 17.5 ARC R11 Touring Car. The track has a 125 usable ft straight and 11 corners. The infield is medium technical but a couple of tricky corners where a lot of torque is needed. I finally ended on 57deg endbell timing, 3.45FDR, Standard spec "Torque" rotor that came in the motor. With ambient temps at 85deg, the motor was coming off at 175 degrees after 6 mins. At 94 deg ambient, it was coming off at 186deg. I will tell you, this motor is fast and does not fade. The sweet spot has a lot of torque, but also a lot of high-end speed. I had it timed at 58deg, but felt it needed a little more punch. The 1deg change was just what she needed!!! Great Motor, Great performance and lots of tuning options with different rotors available from RPM to Ultra-High Torque. Give it a try, you won't be disappointed!!!!
Fast Man
Friday, Sep 9 2016 (5 weeks ago)
Maclan MRR Short Stack Competition Sensored Brushless Motor (17.5T)
After using this motor for a couple of months now, I am extremely happy with it. This motor can keep up and pass the fastest motors on the track. Maclan did a great job with this one. I typically gear this thing around 3.6 FDR and 58 timing on the can for onroad Stock Touring. Motor runs very cool and comes off around 140 degrees at these settings. Amazing motor for sure!