Compass Bicycles modifies each Grand Bois decaleur to make sure the bag is securely attached to the decaleur and does not jump out under normal riding conditions. To remove the bag, you simply pull it upward, and the bag comes off the bike. The Grand Bois decaleur fits Grand Bois and Compass stems, as well as classic René Herse stems (made before 1986).
For very tall frames, we offer a Drop Kit to lower the decaleur.
Note: The decaleur does not replace a rack: The bag still needs to be supported from below.