Hayes 22mm to flat mount brake caliper adapter
thingiverse
Brake adapter for old 22mm Hayes mount (from 90s bikes like Trek, Klein, etc). The photo is with a Shimano BR-M8110, and a PLA prototype. You will need steel or aluminum for the real thing. Remixed from a [post by 737driver](https://bonustomato.com/comment/3834#comment-3834).
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