The Zipp SL-70 Aero[paid link] and SL-70 Ergo handlebars are two of the most advanced offerings in Zipp’s road cockpit lineup, each designed for a distinct rider profile. While they share a common design philosophy centered on stiffness, lightweight carbon construction, and aerodynamic efficiency, their differences are critical for achieving the right fit, comfort, and performance. This guide provides a detailed technical comparison of the Zipp SL-70 Aero[paid link] vs. Zipp SL-70 Ergo, helping you understand their geometry, ergonomics, compatibility, and intended use so you can choose the best option for your setup.
Design and Construction
Both models use Zipp’s unidirectional carbon fiber construction, optimized for stiffness-to-weight ratio and vibration damping. However, their shape and intended functionality differ significantly.
The Zipp SL-70 Aero features a flattened, wing-shaped top section that reduces drag and provides a sleek aerodynamic interface with the wind. The top bar has an integrated airfoil design that Zipp claims saves up to 6.4 watts at 40 km/h compared to a round-tube handlebar. Its tops are not intended for clip-on aero bars due to the flattened shape but are ideal for riders prioritizing aerodynamic advantage in a clean, integrated cockpit setup.
The Zipp SL-70 Ergo, on the other hand, is designed with comfort as its primary focus. It retains a more traditional round or slightly ovalized top section, allowing for greater hand comfort and flexibility when changing positions on long rides. The ergonomic shaping includes a 3° backsweep and 10° ramp angle, creating a more natural wrist position, especially during endurance rides or climbs.
Geometry and Fit
Geometry plays a crucial role in determining rider fit and comfort. The numbers reveal how each handlebar suits different riding styles.
| Specification | Zipp SL-70 Aero | Zipp SL-70 Ergo |
|---|---|---|
| Reach | 70 mm | 70 mm |
| Drop | 128 mm | 128 mm |
| Flare | 0° | 4° |
| Top Section | Wing-shaped (aero) | Round/Oval (ergonomic) |
| Sweep | 0° | 3° backsweep |
| Weight (42 cm) | 240 g | 205 g |
Both handlebars share the same reach and drop, ensuring that transitioning between them won’t require major cockpit adjustments. However, the Aero’s straight profile provides a more aggressive position for racing, while the Ergo’s sweep and flare enhance comfort and control for endurance and gran fondo riding.
Aerodynamics and Performance
The aerodynamic edge of the SL-70 Aero is its defining feature. The flattened tops reduce wind resistance, allowing riders to maintain higher speeds with less effort, especially when riding on the hoods or tops. The seamless airfoil profile integrates smoothly with Zipp’s Service Course[paid link] and SL stems, creating a cohesive aerodynamic front-end.
In contrast, the SL-70 Ergo prioritizes rider stability and comfort over absolute aerodynamic efficiency. While it doesn’t generate measurable aerodynamic gains, it offers superior handling over rough terrain, making it ideal for long-distance endurance riders or those who value all-day comfort over race-level aerodynamics.
Cable Routing and Compatibility
The Zipp SL-70 Aero is optimized for fully internal cable routing. Its underside includes molded cable channels that accommodate both mechanical and electronic drivetrains. When paired with a compatible stem and headset system—especially from brands offering full internal routing like Zipp’s SL Sprint or Service Course SL[paid link]—it achieves a clean, cable-free appearance that maximizes aerodynamic efficiency.
The SL-70 Ergo, meanwhile, offers external cable routing channels beneath the bar. This design simplifies setup and maintenance while still providing a tidy look. Riders who frequently adjust cockpit components or experiment with position changes will find the Ergo’s setup far more serviceable.
Both models are compatible with all major drivetrain systems, including Shimano Di2, SRAM AXS, and Campagnolo EPS. However, due to its shape, the Aero bar is not compatible with clip-on aerobars, while the Ergo bar can support them with proper clamps and adapters.
Comfort and Vibration Damping
Despite its aerodynamic design, the SL-70 Aero delivers excellent vibration damping due to its high-modulus carbon layup. However, its flat tops offer limited ergonomic hand positions, and prolonged use on rough roads can lead to fatigue if the rider frequently rests on the tops.
The SL-70 Ergo excels in this area. Its curved top section allows for natural wrist alignment, reducing strain on long rides. The 3° backsweep positions the rider’s hands slightly inward, improving leverage during climbs and sprints while maintaining comfort on rough terrain. For riders prioritizing hand comfort and fatigue reduction, the Ergo is the clear winner.
Installation and Setup Considerations
Installing both handlebars requires attention to torque values and component compatibility. Zipp recommends using a torque wrench[paid link] set between 4–6 Nm when securing the handlebar to the stem to avoid crushing the carbon structure. Carbon assembly paste should always be applied to prevent slippage.
The SL-70 Aero demands extra care during setup, particularly with integrated cable routing. Mechanics must plan the routing path before installing levers and tape, as re-routing cables post-installation is labor-intensive. Additionally, the flat top section limits clamp-on accessory use.
Conversely, the SL-70 Ergo offers a more forgiving installation process. Its round top tube allows for easy accessory mounting, including lights, GPS computers, and aero extensions. For home mechanics, it’s a more user-friendly option.
Intended Use and Rider Profile
- Zipp SL-70 Aero: Designed for competitive road cyclists and triathletes seeking aerodynamic advantage and high-speed performance. Ideal for race bikes with fully integrated cockpits.
- Zipp SL-70 Ergo: Geared toward endurance riders, gran fondo participants, and cyclists prioritizing comfort, adjustability, and ease of maintenance.
Weight and Handling Differences
Although both models are impressively light, the Ergo is approximately 35 grams lighter than the Aero. While this difference is negligible in real-world performance, it may matter for weight-conscious riders or climbing specialists. The Aero’s stiffer profile enhances sprint stability and front-end precision, while the Ergo provides slightly more flex for shock absorption and comfort.
Aesthetic and Integration Factors
Visually, the SL-70 Aero offers a clean, futuristic appearance, especially when paired with integrated cockpit systems. The flattened tops and hidden cables create a cohesive race-oriented look. The SL-70 Ergo maintains a more traditional aesthetic with visible cabling but offers greater practical versatility, particularly for riders frequently swapping components.
Price and Value Comparison
Both handlebars sit in Zipp’s premium carbon lineup. The SL-70 Aero typically costs slightly more due to its aerodynamic design and complex molding process. For riders chasing marginal gains in time trials or criteriums, the extra investment is justified. Meanwhile, the SL-70 Ergo provides superior value for endurance and all-road cyclists who prioritize comfort and serviceability.
Durability and Maintenance
Zipp’s carbon bars are built to last, but each model has distinct care considerations. The Aero requires careful cleaning around its internal cable ports to prevent debris buildup that could compromise performance. The Ergo demands less maintenance and allows easier inspection for wear or damage. Both should be periodically checked for cracks, especially near the clamp areas.
Final Verdict: Which Handlebar Should You Choose?
Choose the Zipp SL-70 Aero if you value aerodynamic performance, clean integration, and stiffness for sprinting or racing. It’s best suited for performance-focused road cyclists running modern, internally routed setups.
Opt for the Zipp SL-70 Ergo if you prioritize comfort, adjustability, and ease of use. It’s the better choice for long-distance riders, all-road cyclists, and those who frequently adjust their cockpit setup.
In short, the Aero is for speed and integration, while the Ergo is for comfort and versatility—two distinct solutions tailored to different riding goals.