Gilles Berthoud H-91 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.
The H-91 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. The decaleur's bolt replaces the stem's normal clamp bolt.
The extension is 91mm long. 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. If you have a big frame with lowish bars on a 10cm Nitto Pearl stem, and are fitting a 25 series bag, you would most likely need the H-91.
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".