Prologo Bike

Frequently Asked Questions

• Which Prologo saddle is best for road, gravel, and mountain riding?

  For road riding look to the Scratch M5 (round/T shape) for a balance of lightness and pressure relief, especially in Nack-rail versions. For gravel and mixed-surface use the AGX family (Nago R4 PAS AGX, Dimension R2 AGX) for added traction and thicker foam options. For XC, E‑MTB and gravity disciplines consider Dimension and Proxim Sport shapes with reinforced bases and more supportive padding.
• How should I pick Prologo saddle size and shape based on ischial width and riding position?

  Measure your ischial bone width and match it to saddle widths (common options 137–153 mm); riders with wider sit bones or less pelvic flexibility typically move up to 143–153 mm for comfort. Shape matters: round/T shapes (e.g., Scratch M5) suit lower pelvic rotation or more upright positions, while flat/V shapes (e.g., Dimension series) favor highly flexible, aggressive riders. For a precision fit, use Prologo’s Myown fitting system at a dealer to factor in flexibility, BMI and riding discipline.
• How does the Scratch M5 compare to the Dimension 143 and the Dimension R2 AGX?

  The Scratch M5 is a round/T‑shaped, performance road saddle offered in very light Nack‑rail builds with PAS and Active Base for pressure relief and dynamic support. The Dimension 143 is a flatter, more aggressive silhouette with an anatomical center suited to riders who rotate forward on the bike. The Dimension R2 AGX targets gravel with Slide Control traction, optional thicker foam and available 143/153 widths, making it a better choice for mixed terrain and rougher surfaces.
• What do Prologo’s PAS cut‑out and Active Base System do, and when should I choose them?

  The PAS (Perineal Area System) channel/open cut‑out reduces pressure on soft tissue to help prevent numbness on long rides, while the Active Base System adds targeted flex to redistribute pressure dynamically as you pedal. Choose PAS if you experience saddle numbness or plan long endurance days; add Active Base features when you want more in‑motion comfort without sacrificing pedaling efficiency.