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Technical Specifications
Last Updated: 2026-09-03
Weight
Dimensions
Torque
Speed
Current
Temp
Wire
| Identity | |
| Brand |  |
| Product Number | SPMS665 |
| Category | Hobby |
| Performance | |
| Torque |
7.4V277.75 oz-in20.00 kg-cm2.0 N-m |
| Speed |
7.4V0.10 sec/60°600.0 deg/s100.0 RPM |
| Physical | |
| Weight | 2.40 oz68.0 gAverage |
| Dimensions |
L 1.575 in W 0.787 in H 1.654 in L 40.0 mm W 20.0 mm H 42.0 mm |
| Case Material | Aluminum / Plastic |
| Drivetrain | |
| Motor Type | Brushed |
| Gears | Metal |
| Gear Spline/Teeth | 25 T |
| Rotation/Support | Dual Bearings |
| Control & Signal | |
| Modulation | Digital |
| Control System | PWM |
| Electrical & Environment | |
| Operating Voltage | 6–8.4 V |
| Water Rating | Water Resistant |
| Connectivity | |
| Connector | JR (Universal) |
| Wire Length | 300 mm11.81 in |
Disclaimer: Most data is sourced from the manufacturer. Some data is sourced from our loyal community and with the help of AI. We aim for accuracy but are not responsible for inaccurate information.
Class Comparison
| Weight | Average Lighter than 38% of 1880 Digital Standard servos |
Performance Analysis
| Shaft Power | 5.14 W |
| Power Density | 2.505 W/in³ More power-dense than 52% of 1768 Digital Standard servos |
| Torque Density | 4.0846 oz-in/g |
| Torque-to-Volume Ratio | 135.48 oz-in/in³ |
| Speed-to-Weight | 0.14706 (1/sec·g) |
| Speed-Torque Trade-off | 27.78 |
| Voltage Range Width | 2.4 V Wider voltage range than 56% of 1560 Digital Standard servos |
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Reviews (7)
Includes 7 reviews aggregated from around the web.
Retail ratings are high, and owners like the steel gears, strong steering and fast response. Long-term feedback is mixed. Some owners report the stock unit failing within days or months, and Arrma owners often call it a known weak point. Most users still treat it as a solid, affordable replacement and recommend fitting a matching servo saver.
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