Reedy Sonic 540-M3 Spec Brushless Motor (17.5T)

This item is discontinued and no longer available for purchase. You may want to search our site for a similar item.
Low Price: $89.99
Discontinued Online
Reedy's Sonic 540-M3 Spec Brushless Motor appears very similar to the Mach 2 on the outside, but a closer look shows that this is a completely unique motor and nothing has been carried over from the previous model. A 3-piece CNC machined can reduces weight while improving airflow, component fit, and bearing alignment. Heavy-duty silver-plated solder tabs are not only thicker to reduce resistance, but are also cupped to aid soldering, and are well supported to prevent internal connections from fatiguing over time.

Inside, the changes are less obvious, but result in huge performance gains that are much more noticeable. Several wind options are available and all meet ROAR, EFRA, and IFMAR specifications. Sonic 540-M3 Spec motors walk the edge of legality in exchange for maximum power output and RPM thanks to an redesigned stator, pure copper magnet wire, and low-resistance collector rings. Available in short-stack 17.5 and 13.5 versions to suit 1S-powered pan cars and with the right setup, can be used create a power advantage in 2S-powered buggies, trucks, and touring cars.

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.


  • 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
Weight: 170-176g

This product was added to our catalog on August 25, 2015

Sunday, Nov 26 2017 (about a year ago)
Reedy Sonic 540-M3 Spec Brushless Motor (17.5T)
First off, motor is dependable. BUT, itís stupid slow compared to other motors in its class. It seems Reedy is not putting money into SPEC racing. Donít waste your money.
chris boron
Wednesday, Oct 19 2016 (about 2 years ago)
Reedy Sonic 540-M3 Spec Brushless Motor (17.5T)
This motor appears to perform equally well against others priced much higher ($140). The largest jump was easily cleared, and straight away speeds looked identical to the top drivers when we were close together. I geared my B6 with a 72 spur and 28 pinion. The timing is set to maximum (50 degrees), and the motor temp after a six minute main was 125F with motor fan installed.
Robert Marrow
Verified Owner
Friday, Sep 29 2017 (about a year ago)
Reedy Sonic 540-M3 Spec Brushless Motor (17.5T)
Good motor for 2wd buggy
Good power and rpm for a 17.5 motor
Monday, Dec 11 2017 (12 months ago)
Reedy Sonic 540-M3 Spec Brushless Motor (17.5T)
Motor runs cool (around 130) in my RB6.6 but is gutless. Just no low end power. Look for something else.