Decaleurs provide support for larger handlebar bags. By enabling the bag to be mounted lower, they give better handling and keep the bars clear. The Velo Orange decauleurs are designed to be mounted to the fork steerer tube and are available in both 1" and 1 1/8".
Decaleurs are designed to add stability to a bag and work in conjunction with a bag support (front rack). They may require slight bending to adjust for the bag height.
Note, that these decaleurs use metric 5mm posts and receivers. The bag mounts can be used in our old-style 1/4" receivers, but not the other way around.