The Profile Design 43ASC extensions are engineered for triathletes and time trialists who want genuine aerodynamic gains from their extension choice. Carbon fibre construction gives the design freedom to deliver a shape that hugs the rider's forearm closely — reducing drag while maintaining stiffness where it matters.

• CFD-optimised carbon fibre construction minimises aerodynamic drag without compromising strength
• 43° sweep angle positions the grip section at an ergonomic 87mm rise, reducing arm fatigue on long efforts
• Aero-shaped body sweeps up and outward to follow the rider's arm profile for a clean aerodynamic package
• 340mm length suits riders who prefer a shorter reach or are running a compact cockpit setup
• 22.2mm clamp diameter with 16mm total offset for precise positioning
• Designed to pair with Profile Design Plus Series armrests for maximum integration

Carbon fibre allows Profile Design to shape the 43ASC in ways that alloy simply cannot achieve. The result is an extension that is both lighter and more aerodynamic than a conventional round-section tube — without the brittleness concerns of early carbon extensions. The 43° angle is the defining characteristic: it places your wrists in a natural, slightly inward-facing position that many riders find reduces numbness on efforts exceeding 60 minutes.

Compatible with any aerobar bracket using a 22.2mm extension clamp. Pairs best with Profile Design Neosonic or bracket systems that include Plus Series armrests. Minimum usable length from front of clamp is 290mm.