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Carbon aero bars are a popular upgrade for road cyclists seeking a lighter, stiffer, more aerodynamic riding position. This guide highlights five top 31.8mm carbon aero bars from RXL SL that balance performance with value. Each entry includes key specs, a photo, and practical notes to help you choose the right fit for your road bike.

RXL SL Aero Bars UD Matte

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Overview: This carbon handlebar uses T800 carbon fiber, offering an ultra-lightweight build. It weighs approximately 180 g at 420 mm, with a 31.8 mm clamping diameter. Available widths are 400/420/440 mm, with a drop of 123 mm and a reach of 77 mm. The UD Matte finish provides a subdued, race-ready aesthetic. The bar is designed to pair with standard brake systems, delivering a balance of stiffness and compliance for aggressive riding and long-distance comfort.

• Material: T800 carbon fiber
• Weight: ~180 g (420 mm)
• Diameter: 31.8 mm; Widths: 400/420/440 mm
• Drop: 123 mm; Reach: 77 mm
• Finish: UD Matte; Anti-Shock properties

RXL SL Carbon Integrated Aero Bars

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This integrated-bar setup combines the handlebar and stem into a single unit for a clean cockpit and optimized aerodynamics. Width options are 400/420/440 mm, with stem lengths of 90/100/110/120 mm. The fork diameter is 1-1/8″ (28.6 mm), and the bar drop is 127 mm with a reach of 104 mm. Weight is around 360 g. The bar uses T800 carbon fiber for lightness and rigidity, with 2-route options to support internal routing for reduced drag and a sleeker frame line.

• Integrated handlebar and stem
• Width: 400/420/440 mm; Stem: 90/100/110/120 mm
• Diameter: 28.6 mm (1-1/8″); Drop: 127 mm; Reach: 104 mm
• Weight: ~360 g
• Material: T800 carbon fiber; Internal routing support

RXL SL Carbon Handlebar Road 31.8

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Carbon fiber road handlebar with 31.8 mm diameter and a UD Matte finish. Width options are 400/420/440 mm, with a drop of 127 mm and a reach of 104 mm. Weight is about 210 g (±10 g). The bar uses T700 carbon fiber, aiming to balance lightness with stiffness. This option emphasizes aerodynamic shaping and a smoother integration with brake routing on modern road frames.

• Material: T700 carbon fiber
• Weight: ~210 g (±10 g)
• Diameter: 31.8 mm; Widths: 400/420/440 mm
• Drop: 127 mm; Reach: 104 mm
• Finish: UD Matte

RXL SL 44Cm Carbon Drop Bar

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This drop bar is designed for riders seeking a slightly longer reach and a classic drop geometry. Material is carbon fiber, with weight between 200–255 g and a 31.8 mm diameter. Widths available are 400/420/440 mm, with a drop of 119 mm and a reach of 77 mm. Internal routing is supported, and the UD Matte finish offers a clean, race-ready appearance. The bar balances flexibility, stiffness, and aerodynamic profiling for aggressive road riding and endurance events.

• Material: Carbon Fiber
• Weight: 200–255 g
• Diameter: 31.8 mm; Widths: 400/420/440 mm
• Drop: 119 mm; Reach: 77 mm
• Routing: Internal; Finish: UD Matte

RXL SL 31.8X400mm UD Glossy Bar

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UD Glossy finish carbon bar with 31.8 mm diameter and 400/420/440 mm width options. Drop is 130 mm and reach is 80 mm. Weight is approximately 225 g (±10 g). The bar uses T700 carbon fiber, delivering a balance of light weight and torsional stiffness. This option highlights a glossy aesthetic while maintaining aerodynamic efficiency and comfortable hand positions during extended rides.

• Material: T700 carbon fiber
• Weight: ~225 g (±10 g)
• Diameter: 31.8 mm; Widths: 400/420/440 mm
• Drop: 130 mm; Reach: 80 mm
• Finish: UD Glossy

Buying Guide

Choosing the right carbon aero bar involves balancing fit, performance, and installation considerations. Here are key purchase considerations and how they apply to the five models reviewed.

• Compatibility and diameter: Most race and aero bars use 31.8 mm clamps, but some integrated options use 28.6 mm for 1-1/8″ steer tubes. Confirm your stem and handlebar clamp sizes before purchasing.
• Bar width and geometry: Wider widths (400–440 mm) accommodate broader shoulder girths and longer reach, while shorter widths favor compact riding positions. Drop and reach values (e.g., 119–130 mm drop, 77–104 mm reach) influence forearm position and aerodynamics.
• Integrated vs. standard: Integrated bars (stem-and-bar combined) reduce cockpit clutter and can improve aerodynamics, but they may require more precise installation and routing considerations. Standalone bars with a separate stem offer modularity and easier tuning.
• Internal routing: Bars with internal cable routing help minimize drag and provide a cleaner frame appearance. Ensure your derailleur and brake hose routing can accommodate internal routing paths and any required cable holes (e.g., 4-hole routing patterns).
• Weight and material: Carbon fiber bars come in various grades (T700, T800); lighter bars typically offer better stiffness-to-weight ratios but can be more fragile if mishandled. Consider your riding discipline—sprint-heavy, long climbs, or mixed terrain—when weighing weight versus durability.
• Finish and aesthetics: UD Matte, UD Matte, or UD Glossy finishes influence visibility and scratch resistance. Choose a finish that aligns with your bike’s appearance and practical maintenance routine.
• Torque and installation: Follow torque specifications (often around 4 Nm for stem clamps) and use appropriate tools to avoid over-tightening. Improper torque can damage carbon bars or reduce braking control.

Across these five models, riders can select from traditional 31.8 mm aero bars with varying drop and reach, or opt for integrated designs that simplify cockpit routing. For most road cyclists, 400–420 mm widths provide a balanced fit, while 127 mm drop and 100+ mm reach are common targets for comfortable, aerodynamic riding. When choosing, prioritize compatibility with your current stem, braking system, and frame clearance to ensure a safe, efficient upgrade to your road bike.