Source google image: https://www.citycle.com/wp-content/uploads/2014/06/tige-de-selle-de-velo-a-ressort-evolution-425-airwings-noir_full.jpg
Potence de selle de velo
Source google image: https://www.citycle.com/wp-content/uploads/2014/06/tige-de-selle-de-velo-a-ressort-evolution-425-airwings-noir_full.jpg