The TriRig Open Back High Side EVO Arm Cups are designed for athletes who want a more secure and supportive aero position without adding unnecessary bulk. Built from carbon fiber and shaped with an ergonomic 3D-tapered profile, these cups deliver a locked-in feel with a slim, performance-oriented design.

Featuring a high-wall construction and open-back layout, the EVO cups increase arm wrap and surface contact to improve stability and reduce unwanted movement in the aero position. With a medium-snug 95mm arc diameter, they provide a comfortable fit for a wide range of riders while maintaining excellent support over long efforts. Weighing just 535 grams per pair, they balance stiffness, comfort, and lightweight performance.

Designed for easy adjustability, the Open Back High Side EVO Arm Cups use a versatile 3×5 bolt hole pattern with elongated mounting slots to maximize fit options. This allows riders to fine-tune reach, width, and positioning for both aggressive race setups and endurance-focused comfort. Their carbon fiber construction ensures durability while keeping a clean, low-profile look.

The Open Back High Side EVO Arm Cups offer a significant ergonomic upgrade for athletes seeking better arm support, improved fit customization, and a more stable aero position—so you can stay comfortable, confident, and focused when it counts.