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Reedy Sonic 540 M4 Brushless Motor 8.5T Modified
Brand: Reedy
Part No: AS27439
Shadow Stock: Usually ships next day
The Reedy Sonic 540 M4 Brushless Motor 8.5T Modified (AS27439) brings competition-grade performance to 1:10 racing with a lighter, shorter can and refined internal layout. Building on the proven M3 platform, the M4 retains the linear powerband and strong mid-range feel while introducing design updates that enhance precision, efficiency, and handling.
An inner bearing repositioned into the can improves rotor alignment within the magnetic field, reducing noise and vibration. Externally, the shortened can centralises weight within the chassis, and combined design optimisations trim approximately 5–10g for a more responsive setup. A balanced, high-strength rotor delivers powerful, fade-free performance, while precision stainless steel ball bearings reliably handle high RPM loads. Optional rotors are available to fine-tune feel for different tracks and conditions.
Key Features
- CNC-machined lightweight can
- Aluminium end cap
- Lightweight design
- Low-resistance, silver-plated solder tabs
- Optimised air cooling
- Dual precision ball bearings
- Balanced rotor
- High-strength magnet
- Adjustable timing
- Completely rebuildable
- Competition proven
- Built to ROAR/EFRA/IFMAR specs
Specifications
- Cells: 1–2S LiPo
- Diameter: 35.9 mm
- Length: 50.3 mm
- Shaft Diameter: 3.15 mm
- Weight: 160–170 g
Developed for serious racers, the Reedy Sonic 540 M4 8.5T Modified combines precise engineering with practical serviceability. Adjustable timing and a rebuildable design make it easy to dial in power delivery, while the lighter package and improved bearing placement contribute to smooth, consistent performance run after run.
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REEDY SONIC 540 M4 BRUSHLESS MOTOR 8.5T MODIFIED
After months of development, Reedy is proud to announce the release of the Sonic 540-M4 Competition 1:10 Brushless Motor!
Internally, the 540-M4 is very similar to that of the 540-M3 that it replaces - it produces the same linear powerband and excellent mid-range feel that have become synonymous with Reedy’s modified motors. However, changes can be good when they serve a purpose. In the case of the 540-M4, the inner bearing has been moved so that it is part of the can instead of the sensor assembly, which more precisely aligns the rotor within the magnetic field while reducing noise and vibration.
Externally, the motor has been shortened, which results in more centralized weight distribution within the chassis. The reduced length, combined with improvements to the can design, results in a 5-10g reduction in weight.
A balanced, high-strength rotor provides powerful fade-free performance. A variety of optional rotors are available to fine-tune for specific applications and tracks. Precision stainless steel ball bearings have been fitted to reliably accommodate high RPM loads.
Features
- CNC-machined lightweight can
- Aluminum end cap
- Lightweight design
- 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
Specifications
Cells: 1-2S LiPo
Diameter (mm): 35.9
Length (mm): 50.3
Shaft Diameter (mm): 3.15
Weight (g): 160-170
Key Info:
- Brand: Reedy
- Part No: AS27439
- Barcode: 784695274396
- Fitment: Option Part
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