Shimano STI Accessory Mount
by bravinneff, published
Print this object (or if you're really good, machine it from aluminum!) to add accessories to your Shimano STI (Tiagra, 105, Ultegra...) brifters. I have added a Bontrager Trip 4W cycle computer to my bike with some additional details for mounting, but this can be used to accomdate many different things.
By the way, this is my first Thingiverse upload. Just sayin!
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Add an M3 hex head screw and nut for the pinch clamp. At the accessory end, the hole is designed for an M4 screw. Use an M3 set screw in the middle as a lock nut against the Shimano Brifter locator. The wings or tabs at the top are used to reattach the rubber cover the of the shifter.