Side motor, along with hub motor, are commonly pitted against each other in discussions about powering electric vehicles.
Both designs offer unique advantages, but their performance, efficiency, and suitability for specific tasks differ significantly. Let’s break down their key differences to help you choose the right one.
Design & Integration
Side Motor: Mounted adjacent to the wheel (not inside it) and connected via a gearbox or drive shaft.
This design keeps the motor separate from the wheel hub, reducing unsprung weight on the wheel itself
Hub Motor: Embedded directly inside the wheel hub, eliminating the need for additional transmission components.
It integrates the motor and wheel into a single unit, simplifying the overall structure.
Performance & Torque
Benefits from gear reduction, side motor amplifying torque output—critical for off-road terrains with steep climbs or rough surfaces.
Higher peak power (up to 15kW in premium models) and better heat dissipation, enabling sustained high-performance operation.
Hub motor delivers direct power to the wheel, offering instant response and smoother acceleration.
Torque output is generally lower compared to side motor with gear ratios, making them better suited for flat or moderately challenging terrains.
Efficiency & Durability
Side Motor
Higher efficiency (often exceeding 90%) due to optimized gear design and reduced energy loss, especially at high speeds.
Superior durability with robust housing and IP67/IP68 ratings, resisting water, dust, and impacts—ideal for off-road conditions.
Hub Motor
Efficient at low speeds but may suffer from increased energy loss under heavy loads or high speeds due to heat buildup (limited cooling in the wheel hub).
More exposed to road debris and vibrations, requiring careful sealing to maintain longevity.
Application Scenarios
Side Motor: Shines in off-road vehicles, heavy-duty EVs, and high-performance gear where torque, durability, and sustained power matter most. Its gear-driven design conquers steep slopes and rugged trails with ease.
Hub Motor: Excels in urban commuters, lightweight scooters, and low-speed EVs, offering compactness, simplicity, and cost-effectiveness for daily use.
Final Verdict
SiAECOSYS has developed the industry-first SIA120LB side motor, designed for enhanced low-speed performance compared to traditional single-shaft hub motors.
-280N·m peak torque for strong traction in steep slopes and heavy loads
-85% efficiency under load, extending battery life
-IP67 waterproof rating for reliable operation in harsh environments
-11kg lightweight design (30% lighter than hub motors)
-30% lower cost for the complete motor+controller kit
Pre-sale Offer (Ends July 19)
Sample price: $399/set (includes motor & APT2319 controller)
Secure with $100 deposit (fully refundable if you cancel)
Delivery: End of October 2025
Act fast—Contact info@siaecosys.com to get:
Technical specs sheet
Custom PCD/CB configuration options
Choose a wheel-side motor for off-road adventures, heavy loads, or when raw torque and durability are non-negotiable. Opt for a hub motor if you prioritize simplicity, direct response, and efficiency in urban or light-duty scenarios.
Both technologies have their place, but the wheel-side motor’s gear-enhanced power and rugged design make it the clear winner for extreme terrains—proven by innovations like the SIA120LB 1500W motor, which pushes the limits of off-road performance.