Robbe FS 555 BB

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*Spec is estimated from brand data.

Technical Specifications

Last Updated: 2026-07-28

Identity
Brand
Product Number	8538
Category	Hobby
Discontinued	Yes
Performance
Torque	6.0V 42.50 oz-in 4.8V 34.00 oz-in Below Average
Speed	6.0V 0.05 sec/60° 4.8V 0.07 sec/60° Top 10%
Physical
Weight	0.73 ozAbove Average
Dimensions	L 1.18 in W 0.51 in H 1.10 in
Drivetrain
Motor Type	Coreless
Gears	Plastic
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	Below Average Stronger than 14% of 262 Digital Mini servos at 4.8V
Speed	Top 10% Faster than 92% of 263 Digital Mini servos at 4.8V
Weight	Above Average Lighter than 70% of 466 Digital Mini servos

Performance Analysis

Shaft Power	0.90–1.57 W
Power Density	2.374 W/in³ More power-dense than 67% of 440 Digital Mini servos
Torque Density	1.6505 oz-in/g Stronger than 19% of 258 Digital Mini servos
Torque-to-Volume Ratio	51.36 oz-in/in³ Denser torque than 22% of 262 Digital Mini servos
Speed-to-Weight	0.69348 (1/sec·g) Faster than 93% of 259 Digital Mini servos
Speed-Torque Trade-off	2.38 Better balanced than 9% of 261 Digital Mini servos
Torque Gain per Volt	20.83%/V More voltage-responsive (torque) than 76% of 232 Digital Mini servos
Speed Gain per Volt	33.34%/V 4th-highest speed gain per volt of 235 Digital Mini servos
Voltage Range Width	1.2 V Wider voltage range than 31% of 351 Digital Mini servos