The Zipp SL-70 Aero[paid link] handlebars are a high-performance carbon handlebar designed for aerodynamic efficiency, ergonomic comfort, and stiffness that suits both professional racers and serious road cyclists. This guide explains in detail how to install, adjust, and maintain the Zipp SL-70 Aero[paid link] handlebars, including troubleshooting common issues and optimizing the setup for comfort and control.
Tools Required
- 4mm and 5mm hex keys
- Torque wrench[paid link] with Nm scale
- Carbon assembly paste
- Isopropyl alcohol and a clean cloth
- Torque values chart (included with Zipp packaging)
Understanding the Zipp SL-70 Aero Design
The Zipp SL-70 Aero handlebars combine aero shaping with ergonomic comfort. They feature a flattened top section that minimizes wind resistance and provides a stable hand platform. The 70mm reach and 128mm drop offer a compact, race-oriented position that supports efficient transitions between tops, hoods, and drops.
These handlebars are made from unidirectional carbon fiber, providing high stiffness with minimal weight. The integrated internal cable routing is compatible with both mechanical and electronic drivetrains, giving a clean, aerodynamic appearance.
Installation of the Zipp SL-70 Aero Handlebars
Installing the SL-70 Aero requires precision and adherence to torque specifications to prevent damage to the carbon structure.
Preparation
Before installation, clean the stem clamp area with isopropyl alcohol to remove oils or debris. Apply a thin layer of carbon assembly paste to the clamping area to increase friction and reduce the required torque.
Mounting the Handlebar
Insert the Zipp SL-70 Aero into the stem faceplate, aligning the center mark with the stem’s center. Tighten the faceplate bolts evenly in a cross-pattern, bringing each bolt to half the specified torque before completing the final tightening. Zipp recommends a maximum torque of 6 Nm for carbon handlebars unless otherwise specified by the stem manufacturer.
Ensure the flattened aero top is parallel to the ground or at a slight upward angle, depending on rider preference.
Cable Routing
The SL-70 Aero features internal cable channels compatible with mechanical, hydraulic, and electronic systems. Feed the cables through the designated ports using a cable guide tool if necessary. Avoid forcing cables through sharp angles to prevent damage to housing or the bar’s interior lining.
For electronic setups such as Shimano Di2 or SRAM eTap, route wires through the designated internal ports and secure them with minimal tension to avoid rattling.
Adjustment for Comfort and Performance
Proper adjustment is essential to fully realize the aerodynamic and ergonomic benefits of the Zipp SL-70 Aero.
Reach and Drop
The SL-70 Aero’s 70mm reach and 128mm drop are shorter and shallower than traditional designs, allowing for a more compact, aggressive fit. To fine-tune, adjust the lever position so that the transition from tops to hoods is smooth and comfortable. The brake levers should sit just below the bar tops for optimal ergonomics.
Rotation
Rotate the handlebar slightly forward or backward to align the drops with your wrist angle. Small adjustments can significantly affect comfort and aerodynamics. Recheck torque values after rotation.
Stem Angle and Spacer Setup
If using an integrated cockpit or aero stem, ensure the angle complements your preferred riding position. For standard stems, add or remove spacers to fine-tune stack height. Riders seeking maximum aerodynamic gains should aim for a lower stack, while endurance riders may prefer a slightly higher front-end setup.
Maintenance and Care
Routine maintenance ensures long-term reliability and safety.
Clean the handlebars regularly using mild soap and water, followed by a wipe-down with isopropyl alcohol to remove sweat and grime. Avoid harsh solvents that can degrade the carbon finish.
Inspect the clamp areas for cracks, stress marks, or surface delamination every few months—particularly after a crash or impact. Reapply carbon assembly paste whenever the bar is removed or adjusted.
Check torque values periodically, as bolts can loosen over time due to vibration. Always use a torque wrench[paid link] when re-tightening to avoid over-compression of the carbon structure.
Troubleshooting Common Issues
Handlebar Slippage
If the handlebar slips under load, it’s usually due to insufficient friction or incorrect torque. Remove the bar, clean both clamping surfaces, reapply carbon paste, and torque to the manufacturer’s specification. Avoid exceeding 6 Nm.
Cable Rattling
Internal cable noise often results from loose housing or wires. Use cable sleeves or foam insulation inside the routing channels to eliminate rattles.
Misaligned Levers
If the brake or shift levers feel uneven, loosen their clamps slightly and reposition them symmetrically. Check that both levers align evenly when viewed from the front.
Customization and Optimization
The SL-70 Aero can be customized to fit a wide range of rider preferences. Riders focused on time-trial performance may integrate aero extensions using Zipp’s compatible clip-on system. For endurance riders, consider using gel handlebar tape to increase comfort on long rides.
Using lightweight carbon stems and internal routing-compatible shifters enhances the aerodynamic benefits of the SL-70 Aero. Riders using electronic groupsets can achieve a nearly cable-free front profile, maximizing aerodynamic efficiency.
Comparison with Similar Models
Compared to the Zipp Service Course SL[paid link]-70 Ergo, the SL-70 Aero provides a noticeable aerodynamic advantage due to its flat top section and hidden cable design. The Ergo model, however, offers a slightly more comfortable hand position for long endurance rides.
The Zipp SL-80 Aero provides a longer reach and slightly deeper drop, catering to taller riders or those seeking a more aggressive race setup. For most riders, the SL-70 Aero strikes the ideal balance between comfort, stiffness, and aerodynamics.
Compatibility Overview
The Zipp SL-70 Aero is compatible with most modern road stems, both round and aero types, as long as they support a 31.8mm clamp diameter. It works with all major groupsets, including Shimano Di2, SRAM eTap, and Campagnolo EPS. The handlebar supports both mechanical and hydraulic braking systems.
Avoid using stems with non-standard clamp shapes or oversized clamping areas, as these may cause point-loading and structural damage. Always verify compatibility with Zipp’s official documentation or your bike manufacturer before installation.
Final Checks and Safety Tips
Before every ride, inspect the handlebar for visible damage or movement. Grip the drops firmly and apply downward pressure—if any creaking or flexing occurs, stop and recheck torque values immediately.
When transporting the bike, avoid clamping the handlebar in repair stands or travel cases. Instead, secure the frame or seatpost to prevent undue stress on the carbon surface.
By following these detailed installation, adjustment, and maintenance steps, the Zipp SL-70 Aero handlebars will deliver optimal aerodynamic efficiency, precise control, and long-term reliability. Proper setup ensures not only comfort and performance but also safety during high-speed descents and intense sprint efforts.