One of the issues with the new Flat Mount standard is the complexity of available caliper mount installations. You either have to notch or miter the chainstay, or use a dropout with an integrated caliper mount. The ISO and Post Mount systems used a simple tab that was cut to match the frame or fork profile, and simply welded in place. They were inexpensive, flexible, and straightforward.
I am experimenting with the idea of a Flat Mount tab, similar in concept to the ISO and Post Mount tabs, but positioned horizontally rather than vertically. The tab could then be cut to match the chainstay, just like an ISO or Post Mount tab. The issue is how to attach it to the chainstay if the placement zone is not perfectly parallel to the tab. It's not an insurmountable challenge. Rods or other simple pieces could be welded from below to fill the space under the tab, providing a level surface for the tab. Alternately, the tab could be fillet brazed in place.
Anyway, I thought some of you might be interested in an alternate method, even if it is just a starting point for developing other ideas.
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