Profile Design 4525a Aluminum Aerobar Extensions – Precision Fit for Maximum Performance
The Profile Design 4525a Aluminum Aerobar Extensions combine ergonomic innovation with proven aerodynamics to help riders achieve their most efficient and comfortable position on the bike. Evolved from the renowned T-Series, this latest generation offers refined geometry, enhanced adjustability, and superior control for triathletes and time trialists alike.
Design Evolution & Purpose
Building upon years of athlete feedback and wind tunnel development, the 4525a represents the next step in Profile Design’s evolution of aerobar fit technology. The new naming system identifies both angle and material, making it easy to select the perfect match for your riding style — in this case, a 45° / 25° dual-angle in 6061-T6 aluminum.
The extensions are engineered with one goal in mind:
✅ To deliver a comfortable and aerodynamic hand position, allowing riders to stay relaxed, efficient, and powerful for longer durations.
Performance & Fit Features
🔹 Dual-Angle Geometry (45° / 25°)
The first section rises at 45°, with the grip portion angled at 25°, giving riders two natural hand positions:
High hold for a compact, shrugged aero posture.
Low hold for a more open, head-up stance.
Perfect for customizing hand elevation to match your preferred aerodynamics and breathing position.
🔹 Enhanced Fit Range
Offers a 7.5mm lateral shift per side, allowing hands to be positioned narrower or wider without excessive tilt or shifter interference.
Enables micro-adjustments for optimal comfort and control during endurance efforts.
🔹 Evolved Design for Modern Aerobar Trends
Reflects current pro-level fit trends toward higher hand positions for improved aero efficiency and shoulder comfort.
Provides a multi-position platform, making it a versatile choice for both competitive and endurance riders.
Technical Specifications
SpecificationDetailExtension Length400mmExtension Angle45° / 25°Outer Diameter22.2mm (standard clamp size)Cable RoutingInternal, rear-exit (no external cable holes)Construction6061-T6 AluminumFinishAnodized Matte BlackIncludes1 Pair (Left + Right Extension)Weight200g / pair
Why Choose the 4525a Extensions
Dual-angle design (45° / 25°) for versatile, natural hand positioning.
Lightweight 6061-T6 aluminum for stiffness and reliability.
Rear-exit cable routing for a clean, aerodynamic setup.
Optimized for modern aero fit trends, offering both comfort and control.
Perfect for triathlon and time trial applications, where position efficiency is key.
The Profile Design 4525a Aluminum Extensions are built to help every rider find their ideal aerodynamic posture — combining precision fit, lightweight strength, and proven comfort for peak performance across any distance.
