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Selle velo telescopique
Source google image: http://www.raceco-blog.com/wp-content/uploads/2014/02/1-SBTSUNI-tige-de-selle-SB3-unicolor-telescopique-ajustable-vtt-pas-chere-levier-guidon-cable-piece-montage-v%C3%A9lo-31.6-r%C3%A9glage.jpg