Gilles Berthoud H-121 Decaleur (Pearl/Technomic)
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Decaleur's help stabilize a traditional transverse handlebar bag when mounted on a bike's front rack. The Berthoud decaleur's come in three versions with different length extensions. All mount onto the bike's stem.
Just like the H-91, this H-121 decaleur fits quill stems like the Nitto Pearl, Technomic Deluxe, Technomic, or any quill stem whose clamp bolt passes horizontally through the stem clamp and into a threaded nut. The "H" stands for Horizontal mount, and 121 denotes the length of 121mm. The decaleur's bolt replaces the stem's normal clamp bolt.
You choose the size of the decaluer dependent on the size of your bike, height of your headtube, and bar position in relation to you particular bag.
Three tubes attach the bag to the decaleur. Two are directly mounted to the bag, and all three are connected by a long "cotter pin".