The CEC #300 carbon seatpost embodies the Carbon Endurance Component philosophy: combining extreme lightness, uncompromising robustness, and vibration comfort for long distances. Developed by Pierre-Arnaud Le Magnan, with over 35 years of expertise in carbon fabrication, this seatpost illustrates French craftsmanship applied to high-end components for endurance and ultra-distance.

Technical Summary

Designed in unidirectional T700 carbon, the CEC #300 seatpost boasts a featherweight of 175 grams in 300 mm length, while guaranteeing optimal stiffness and remarkable vibration absorption on all terrain types. Its aluminum cradle with double stainless steel bolts ensures universal compatibility with standard seat rails (7 mm round) as well as oval carbon rails (7x10 mm), offering total versatility for your road, gravel, or MTB setups.

Technical Highlights

• High-performance T700 carbon: the unidirectional fiber provides an excellent stiffness-to-weight ratio while filtering road vibrations, essential for endurance and long rides.
• Robust aluminum cradle: the two stainless steel bolt clamping system allows precise and independent saddle angle adjustment, with impeccable durability over time.
• Universal 27.2 mm diameter: the most widespread standard on modern road, gravel, and MTB frames, compatible with the majority of seat clamps.
• Zero offset: the inline design (0 mm setback) offers a clean position and great freedom for fore-aft adjustment via the saddle rails.
• Matte finish and graduation: the understated aesthetic comes with height markers engraved on the rear, facilitating repeated adjustments and bike changes.
• Versatility across disciplines: its robustness and featherweight make it an ideal choice for fast road riding, committed gravel, and marathon MTB.

Geometry and Standards

The CEC #300 seatpost measures 300 mm total length, perfect dimension for cyclists size S to L seeking secure insertion in the seat tube without unnecessary weight. The 27.2 mm diameter corresponds to the most common modern standard, ensuring universal fitment on recent titanium, steel, aluminum, or carbon frames. The 0 mm offset simplifies positioning and maximizes saddle adjustment range via its rails, without imposing a fixed setback. The cradle accepts both 7 mm round steel/titanium rails and 7x10 mm oval carbon rails, guaranteeing extended compatibility with modern high-end saddles.

Design and CEC Craftsmanship

Carbon Endurance Component was born from the desire to offer components worthy of Chiru Bikes frames. After two years of intensive testing in real ultra-distance conditions and adventure races around the world, CEC has established itself as a reference in the carbon component universe for endurance. The #300 seatpost benefits from this rigorous development: it combines proven T700 carbon construction, metal inserts dimensioned to withstand mechanical stresses, and careful assembly guaranteeing longevity and reliability. The matte finish with discreet black logo integrates harmoniously with all frame styles, while the rear graduation facilitates precise saddle height adjustments.

Available Variants

• 300 mm variant: 175 g, ideal length for S to L cyclists — reference CEC #300 (EAN 2001000078486)
• 380 mm variant: 190 g, intended for large sizes and XL frames requiring more height — reference CEC #380

Both variants share the same T700 carbon design, the same aluminum cradle, and the same rail compatibility. Only the length and mass differ, allowing each cyclist to choose the version suited to their morphology and frame, without compromise on quality or performance.