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Gemini Seatposts are ultralight carbon components designed for cyclists who prioritize precision, strength and weight savings. Manufactured in Barcelona using forged carbon unishell technology, they deliver top-tier stiffness-to-weight ratios and a clean, integrated look. These posts come in various diameters and lengths, including a version built specifically for the Specialized Tarmac SL8. With both lightweight and performance layup options, Gemini Seatposts suit serious riders who want to upgrade without compromise.
Additional Gemini Seatpost Info:
Gemini Seatposts stand out for their forged carbon construction, integrated clamp design and impressively low weight. The Älsak model is the flagship — a one-piece carbon seatpost without bonded joints or external hardware. Its monocoque structure boosts stiffness, improves reliability and cuts unnecessary grams. In addition, riders can choose between Lightweight and Performance layups based on their weight and ride preferences. The lightest version weighs just 73 grams.
Each seatpost is built in Barcelona with aerospace-grade carbon fiber. Gemini hand-finishes, ultrasound-tests and UV-coats every unit to ensure quality and durability. The design fits both round and oval saddle rails and works with a wide range of modern frames. For Specialized Tarmac SL8 riders, Gemini offers a direct-fit Älsak variant that preserves aerodynamic shape and precise fit.
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Gemini Alsak Seatpost
$399.9992 gram carbon fiber seatpost for road, gravel and XC -
Ultralight carbon fiber seatpost for Specialized SL8 frames
