Robbe FS 550 BB MG

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*Spec is estimated from brand data.

Technical Specifications

Last Updated: 2026-07-28

Identity
Brand
Product Number	8522
Category	Hobby
Discontinued	Yes
Performance
Torque	6.0V 58.30 oz-in 4.8V 48.60 oz-in Average
Speed	6.0V 0.16 sec/60° 4.8V 0.21 sec/60° Bottom 10%
Physical
Weight	0.75 ozAbove Average
Dimensions	L 1.18 in W 0.51 in H 1.24 in
Drivetrain
Gears	Metal
Gear Spline/Teeth	25 T estimate
Rotation/Support	Single Bearing
Control & Signal
Modulation	Digital
Control System	PWM
Electrical & Environment
Operating Voltage	4.8–6 V
Connectivity
Connector	JR (Universal) estimate

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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.

Compatible Hardware

Amazon eBay

*Spec is estimated from brand data.

Class Comparison

Torque	Average Stronger than 36% of 262 Digital Mini servos at 4.8V
Speed	Bottom 10% Faster than 3% of 263 Digital Mini servos at 4.8V
Weight	Above Average Lighter than 66% of 466 Digital Mini servos

Performance Analysis

Shaft Power	0.43–0.67 W
Power Density	0.903 W/in³ More power-dense than 14% of 440 Digital Mini servos
Torque Density	2.2925 oz-in/g Stronger than 46% of 258 Digital Mini servos
Torque-to-Volume Ratio	65.13 oz-in/in³ Denser torque than 38% of 262 Digital Mini servos
Speed-to-Weight	0.22462 (1/sec·g) Faster than 20% of 259 Digital Mini servos
Speed-Torque Trade-off	10.21 Better balanced than 67% of 261 Digital Mini servos
Torque Gain per Volt	16.63%/V More voltage-responsive (torque) than 54% of 232 Digital Mini servos
Speed Gain per Volt	26.05%/V More voltage-responsive (speed) than 94% of 235 Digital Mini servos
Voltage Range Width	1.2 V Wider voltage range than 31% of 351 Digital Mini servos