Bontrager RSL Aero Road Handlebar
Our RSL Aero Road Handlebar is engineered for riders who demand every advantage on race day. Built from ultra-lightweight OCLV Carbon, this handlebar combines wind-tunnel-tested aerodynamics with ergonomic shaping that supports aggressive riding positions without sacrificing comfort.
We designed the RSL Aero with a truncated airfoil profile that reduces drag while maintaining the stiffness professional cyclists need for out-of-the-saddle sprints and technical descents. The compact drop geometry places your hands in the optimal position for commanding power transfer and responsive handling through fast corners and demanding climbs.
RSL Aero specifications
OCLV Carbon construction technology
We manufacture the RSL Aero Road Handlebar using our proprietary OCLV Carbon layup process, which optimizes fiber orientation in each zone of the handlebar for targeted performance characteristics. The result is a cockpit component that achieves Tour-level stiffness while remaining impressively lightweight.
Every layer of carbon fiber is positioned to resist the specific forces cyclists generate during hard efforts—torsional loads during sprints, bending forces on climbs, and impact absorption on rough pavement. This engineered approach allows us to remove excess material where it isn’t needed, creating a handlebar that won’t flex under power yet absorbs high-frequency road vibration that causes hand fatigue on long rides.
Aerodynamic profile and drag reduction
The truncated airfoil cross-section of the RSL Aero represents hundreds of hours in computational fluid dynamics modeling and physical wind tunnel validation. We shaped the top section and drops to minimize frontal area and manage airflow separation, reducing drag across the yaw angles cyclists encounter in real-world conditions.
Wind tunnel testing results
Our aerodynamics team documented measurable watt savings compared to traditional round-profile handlebars at speeds above 40 km/h. The flattened top section creates a smooth transition from stem to bar, eliminating the turbulent wake that robs speed. For time trialists and criterium racers, these marginal gains accumulate into real performance advantages over the course of an event.
Sizing and fit considerations
Selecting the correct width is critical for maximizing both aerodynamics and comfort on the RSL Aero Road Handlebar. We offer four widths measured center-to-center at the hoods: 38cm, 40cm, 42cm, and 44cm. Most riders achieve optimal shoulder alignment and breathing efficiency by matching handlebar width to shoulder width measured from acromion to acromion.
The compact drop geometry features 125mm of drop and 80mm of reach, dimensions that suit riders who prefer a lower, more aerodynamic hand position without excessive stretching. This shaping works particularly well with modern race bike geometries that position riders in aggressive, forward-leaning postures. If you’re transitioning from traditional anatomic or shallow drop bars, we recommend test riding to confirm the compact shape suits your flexibility and riding style before committing to the RSL Aero.
Precision cockpit components for race-ready performance
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Questions about the RSL Aero Road Handlebar
Select a width that matches your shoulder width measured from the bony protrusions at the top of each shoulder (acromion points). Most riders find optimal comfort and breathing efficiency with handlebar width that matches this measurement.
The RSL Aero is available in 38cm, 40cm, 42cm, and 44cm widths measured center-to-center at the hoods. If you're between sizes, we recommend sizing down for more aerodynamic positioning or sizing up for enhanced stability and control on technical descents.
The RSL Aero uses the industry-standard 31.8mm clamp diameter, making it compatible with the vast majority of modern road bike stems. Before purchasing, verify that your stem specifies a 31.8mm handlebar clamp size.
The internal cable routing channels are designed to work with most contemporary frame routing systems, though the cleanest integration occurs with Bontrager stems and frames featuring aligned cable entry points.
The 42cm width RSL Aero Road Handlebar weighs approximately 215 grams. Smaller widths are slightly lighter, while the 44cm width adds a few grams.
This exceptional weight-to-stiffness ratio comes from our OCLV Carbon manufacturing process, which strategically places carbon fiber only where structural demands require it.
We recommend tightening stem faceplate bolts to 5-6 Newton-meters (Nm) when installing the RSL Aero Road Handlebar. Always use a calibrated torque wrench to avoid over-tightening, which can damage carbon fiber.
Tighten bolts in a cross-pattern sequence to ensure even clamping pressure across the handlebar. Check that the handlebar is centered and aligned before final tightening, and verify that the gap between the stem faceplate and body is even on both sides.
The RSL Aero's compact drop geometry (125mm drop, 80mm reach) is optimized for aggressive racing positions rather than all-day endurance comfort. Riders with good flexibility who regularly ride in the drops will find the compact shape comfortable for extended periods.
If you primarily ride on the hoods and rarely use the drops, or if you prioritize comfort over aerodynamics for centuries and gran fondos, consider our Elite or Pro handlebar models with more relaxed shaping.
While the bontrager rsl aero road handlebar is engineered specifically for paved road racing, its robust OCLV Carbon construction can handle occasional gravel road sections. However, the compact drop geometry and aerodynamic profile are less ideal for the varied hand positions and upright postures that enhance comfort and control on extended gravel rides.
For dedicated gravel and all-road cycling, we recommend exploring our gravel-specific handlebar lineup featuring flared drops and additional hand positions suited to mixed-terrain adventures.
We designed the RSL Aero to pair perfectly with our Pro VR-C handlebar tape, which features gel backing for vibration damping and a tacky microfiber surface that maintains grip in wet conditions. The tape's 2.5mm thickness provides cushioning without adding excessive bulk to the compact drop profile.
Any quality road handlebar tape will work with the RSL Aero, though thinner tapes (2-3mm) preserve the bar's aerodynamic shaping better than heavily padded options that increase frontal area.