Nago R4 PAS AGX

The new Nago R4 PAS AGX is the semi-round, T-shaped saddle that completes Prologo’s AGX line. It is the gravel version of the iconic Nago R4.

AGX, which stands for Adventure – Gravel – Cyclocross, is a line of ergonomic saddles designed for gravel and all-road riding, built to provide the right balance between performance and comfort on every type of terrain, even over long distances.

Compared to traditional models, AGX saddles feature a more flexible base made from next-generation materials and an extra 2 mm of padding made from low-density foams.
These features ensure better shock and vibration absorption without limiting or compromising power transfer — even when riding on rough terrain.

Anatomical Shape

The saddle’s signature T-shape offers improved freedom of movement and positioning, delivering comfort and protection in high-friction zones. The rear-positioned anatomical center allows the rider to easily shift positions and use the full length of the saddle.

The semi-round anatomical shape of the Nago R4 AGX provides extra support to the lumbar area, helping maintain a stable position, even for riders with limited pelvic mobility.

Technologies

The Multi Sector System features separate, individually mapped zones on the saddle, each made with different interactive foams and single-cell padding.
Prologo’s 3D Slide Control technology enhances grip and rider stability, helping maintain the correct position, even when riding off-road.
The PAS (Perineal Area System) central channel eliminates pressure peaks and numbness by improving blood flow. The ergonomic design and variable-density foams help reduce pressure points in the perineal area.

Base and Rails

The saddle is available with Nack rails (Nano Carbon Fiber), made from carbon fiber, Kevlar, and aluminum filaments — perfect for cyclists seeking maximum stiffness and lightness — or TiroX rails (light alloy steel), offering excellent vibration absorption.
The base is made from long-fiber carbon for the Nack version, or injected carbon fiber for the TiroX version. Both materials offer a great balance between stiffness and comfort.

Technical Specifications

• Size: 245 x 137 mm
• Weight: 155 g with Nack rail
• Weight: 197 g with TiroX rail
• T-shape and semi-round profile
• 2 mm extra padding
• 3D Slide Control for enhanced grip and stability
• Multi Sector System to adapt to rider morphology
• PAS channel to prevent pressure peaks
• Carbon fiber base
• Rail options: Nack (carbon fiber, Kevlar, aluminum filaments) or TiroX (light alloy steel)