Source google image: http://cycles-fun-passion.com/wp-content/uploads/2016/10/Potence-Stem-AVA-vintage-road-bike-velo-bicyclette-pi%C3%A8ce-cycles-fun-passion-ancien-ref49pt-300×300.jpg
Diametre potence velo ancien
Source google image: http://cycles-fun-passion.com/wp-content/uploads/2016/10/Potence-Stem-AVA-vintage-road-bike-velo-bicyclette-pi%C3%A8ce-cycles-fun-passion-ancien-ref49pt-300×300.jpg