The 540-M4 Driver Edition is technically identical to the standard 540-M4, but is instead equipped with the popular #27447 rotor. This rotor is the lowest strength option, which is reported to improve throttle feel and consistency, resulting in better overall race times. Four versions featuring the most popular "dirt" winds will be available initially, with the potential for more to follow.

All Sonic 540-M4 versions are ROAR, EFRA, BRCA, and IFMAR approved.

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Features:

• CNC-machined lightweight can
• Aluminum end cap
• Low-resistance, silver plated solder tabs
• Optimized air cooling
• Dual precision ball bearings
• Balanced rotor
• Performance specific magnet
• Adjustable timing
• Completely rebuildable
• Competition proven
• ROAR, EFRA, BRCA, and IFMAR approved

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Specifications:

• Cells: 1-2S LiPo
• Diameter (mm): 35.9
• Length (mm): 50.3
• Shaft Diameter (mm): 3.15
• Weight (g): 160-170
• Stock Rotor: 27447
• Bearings: 1/8 x 3/8 x 5/32 (x1), 1/8 x 5/16 x 9/64 (x1)