The idea is to use a stainless steel chainring and attach a disc brake caliper to the chainstay to grab the chainring as if it was a disc brake rotor. The rear wheel must be a fixed gear set up in order for the brake to work.
first I took a Surly stainless steel sprocket and machined it so it didn't have a lip on the back side. My first idea about 2 years ago, was just laser cutting a sprocket and for the last 2 years the 3D model has been sitting in my Solidworks software file waiting to be cut. I forgot all about the Surly Chainring and how perfect it would work for this project.
The mounts for the Avid Juicy caliper was super easy to make and weld on, plus it adds a lot of stiffness to the non drive chainstays because of its link to the bottom bracket.
I havn't done any of the routing for the hose because I didn't know how well the sprocket brake would work so for now the good old electrical tape will have to work.
This is on the frame I built for Brie before Christmas ( see older post ) so its will be my test bike and I will keep you kids up to date on the progress.