Reedy Sonic 540-M3 Short Stack 10.5 and 21.5 Motors

Due to popular demand, short stack 10.5 and 21.5 versions of Reedy’s Sonic 540-M3 are now in stock and available for immediate delivery!

A competition-proven short stack stator, wound with pure copper magnet wire and low-resistance collector rings, walks the edge of legality in exchange for maximum power output and RPM. Despite being designed for 1S applications, short stack motors can, under the right circumstances, create a power advantage in 2S applications such as F1 and 4WD GT classes.


Like all 540-M3 motors, these new models feature a three-piece, CNC-machined can to reduce weight while improving airflow, component fit, and bearing alignment. Heavy-duty silver-plated solder tabs reduce resistance, feature a cupped profile to aid soldering, and are well supported to prevent internal connections from fatiguing over time.

A balanced, high-strength sintered rotor provides powerful, fade-free performance thanks to improved manufacturing processes. To fine-tune for specific applications and tracks, a variety of optional rotors are available. Lastly, larger precision stainless steel ball bearings have been fitted to accommodate high RPM loads with improved reliability.

Both models meet ROAR, EFRA, and IFMAR specifications. Visit for a complete list of tuning rotors, replacement/option parts, and detailed specifications.


  • CNC-machined, lightweight, 3-piece can
  • Aluminum end cap
  • Low-resistance, silver-plated solder tabs
  • Optimized air cooling
  • Dual precision ball bearings
  • Balanced rotor
  • High-strength magnet
  • Adjustable timing
  • Completely rebuildable
  • Competition proven
  • Built to ROAR/EFRA/IFMAR specs


Cells 1-2S LiPo
Diameter 35.8mm
Length 52.7mm
Shaft Diameter 3.15mm



For more information, visit


Sylvain Lafrance

Sylvain Lafrance

Hello, my name is Sylvain Lafrance and I am the man behind I have bought my first hobby grade RC in the early 90s. With years, what that started as a simple hobby, quickly became a strong passion. I am so much passionate about R/C that I have created in 2006 to share my experiences with R/C products that I use for racing and bashing. Follow me !

Leave a Reply

Your email address will not be published. Required fields are marked *


Privacy Policy - Terms Of Service - Sitemap