Prologo Nago R4 Nack 137 Saddle - Black

Prologo Nago R4 Nack 137 Saddle – Professional Performance and Absolute Comfort

The Prologo Nago R4 Nack 137 is a next-generation cycling saddle designed to offer maximum performance, advanced ergonomics, and comfort even on long rides. Developed to meet the needs of professional cyclists and refined through Pressure Map MyOwn testing, it represents the modern evolution of an iconic model.

The Nago R4 (Redesign 4) is born from the experience of the historic NAGO, introduced in 2008 and winner of a Giro d’Italia and numerous Classics, now reinterpreted with cutting-edge technologies and materials.

Anatomical Shape and Advanced Ergonomics

The T-shape structure ensures greater freedom of movement thanks to a wider support surface. The rearward anatomical center allows the rider to easily change position, making full use of the saddle’s length.

The ergonomic semi-round shape makes this saddle ideal for cyclists with medium pelvic rotation flexibility, while the compact width of 137 mm is perfect for those with a narrow ischial bone distance.

Prologo Technologies for Comfort and Performance

The closed version of the Nago R4 is designed with 3 independent sections, made with next-generation variable density foams, to provide optimal support at every phase of the pedal stroke.

Prologo’s Active Base system, with a perforated center base, combines:

• the advantages of a closed saddle (larger support surface)
• the benefits of an open saddle (pressure reduction)

Result: superior comfort and optimal weight distribution.

Premium Materials: Lightness and Durability

The saddle is available in two high-end configurations:

• Long fiber carbon base + Nack Rail (nano carbon fiber)
  → maximum lightness, stiffness, and performance
• Injected carbon base + Tirox Rail (light alloy steel)
  → better balance between weight and durability, enhanced vibration absorption

Technical Specifications

• Size: 245 x 137 mm
• Saddle weight with Nack rail: 142 g
• Shape: T-Shape with semi-round profile
• System: Active Base System to reduce pressure and increase comfort
• Base: carbon
• Rail:
  • Nack (carbon fiber, Kevlar, and aluminum filaments)

Why Choose the Prologo Nago R4 Nack 137

Perfect for demanding cyclists, this saddle guarantees high performance, ergonomic support, and lasting comfort, making it ideal for both training and competition.

If you’re looking for a racing saddle with advanced technologies and premium materials, the Nago R4 is the ultimate choice.