Profile Design Riser Kit for Aerobars 40mm Black One Size — Forged Alloy, Marine-Grade Bolts

The Profile Design Riser Kit 40mm black is a forged-alloy stack spacer set that raises Profile aerobars by 40mm to fine-tune fit and improve comfort while preserving aero performance.

Whether you're dialing in triathlon position or adjusting for longer rides, the 40mm riser gives precise vertical lift for Profile Design aerobars without relying on steerer-tube spacers. Each riser is forged and machined from alloy and fastened with marine-grade steel bolts so the stack stays secure under load and in wet conditions. Wind-tunnel testing by Profile Design indicates that raising armrest stack with risers, rather than adding stem spacers, can cut overall drag—making risers a performance-conscious way to change stack height.

How does this riser kit change my riding position?

Raising the armrest stack by 40mm moves your forearms and torso upward relative to the front wheel, reducing flex and strain in the neck and shoulders for many riders. Small, dedicated spacers like this kit let you make targeted changes without altering stem angle or reach. The result is a more consistent, repeatable fit specific to your aerobar model.

• Fixed 40mm vertical increase designed for Profile Design aerobars
• Works with Sonic Ergo, Supersonic Ergo, T+ Carbon and T+ Aluminium series
• Changes stack without modifying stem or headset spacers

Will the riser kit affect aerodynamics and speed?

Using risers to raise the armrest stack typically preserves a cleaner airflow around the headset compared with adding steerer-tube spacers below the stem. Profile Design’s testing shows stacking at the armrest reduces drag penalties versus moving the stem. That said, overall aerodynamics depend on body position and equipment combination, so changes are best evaluated with self-testing or professional fit analysis.

• Designed to minimize added drag compared with stem spacers
• Compact profile keeps frontal area low
• Use with compatible aerobars for optimal results

What materials and hardware are used for durability?

Each riser in this kit is forged and machined from lightweight alloy for a strong, fatigue-resistant part that keeps weight down. Bolts are marine-grade steel to resist corrosion from sweat and wet-weather exposure, ensuring reliable clamping force over time. The precision machining ensures a snug, wobble-free stack when installed correctly.

• Forged, machined alloy riser bodies for strength and light weight
• Marine-grade steel fastening bolts for corrosion resistance
• Precision tolerances for secure stack alignment

Which aerobars and setups are compatible with this kit?

The 40mm riser is built specifically for Profile Design aero systems and fits a range of their models. It’s compatible with Sonic Ergo (35a, 45/25a and 50a), Supersonic Ergo (35a, 45/25a and 50a), and both the T+ Carbon and T+ Aluminium series. If you run other brands, check clamp diameter and mounting style—this kit assumes the Profile Design armrest clamp interface.

• Compatible models: Sonic Ergo, Supersonic Ergo, T+ Carbon, T+ Aluminium
• Clamp diameter: 31.8 mm interface where applicable
• Available in other stack increments (20mm–70mm) if different lift is needed

Who is this for: The Profile Design Riser Kit 40mm in black is aimed at triathletes, time-trialists, and fit-focused road riders who use Profile Design aerobars and need a reliable, aero-friendly way to increase armrest stack. It’s useful when adjusting fit after coaching or bike fit sessions, when shifting from shorter to longer rides, or when trying to reduce neck and shoulder strain without changing stem geometry. Install with proper torque and verify compatibility with your specific Profile Design aerobar model before riding.