TowerPro SG91R

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*Spec is estimated from brand data.

Technical Specifications

Last Updated: 2026-09-16

Identity
Brand
Category	Hobby
Discontinued	Yes
Performance
Torque	4.8V25.00 oz-inBelow Average
Speed	4.8V0.10 sec/60°Top 10%
Physical
Weight	0.32 ozTop 10%
Dimensions	L 0.91 in W 0.48 in H 1.14 in
Drivetrain
Gears	Plastic
Gear Spline/Teeth	21 T estimate
Rotation/Support	Bushing
Control & Signal
Modulation	Analog
Dead Band	10 µs
Control System	PWM
Programmable	No
Electrical & Environment
Operating Voltage	4.8–6 V
Temperature	0–55 °C
Certification	RoHS
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 16% of 77 Analog Mini servos at 4.8V
Speed	Top 10% Faster than 91% of 77 Analog Mini servos at 4.8V
Weight	Top 10% Lighter than 99% of 161 Analog Mini servos

Performance Analysis

Shaft Power	0.46 W
Power Density	0.928 W/in³ More power-dense than 60% of 158 Analog Mini servos
Torque Density	2.7778 oz-in/g Stronger than 92% of 77 Analog Mini servos
Torque-to-Volume Ratio	50.21 oz-in/in³ Denser torque than 42% of 77 Analog Mini servos
Speed-to-Weight	1.11111 (1/sec·g) 3rd-highest speed-to-weight of 77 Analog Mini servos
Speed-Torque Trade-off	2.50 Better balanced than 13% of 77 Analog Mini servos
Voltage Range Width	1.2 V Wider voltage range than 57% of 88 Analog Mini servos