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If I use a smaller rotor can I get this brake to work on the back?
You'd probably need a custom adapter. All the dimensioned drawings are available online, so draw a front mount over a rear mount and try to get the holes to line up. I could do it myself, but I have youtube videos to watch :) Let us know whether they are IS or PM, and what native rotor sizes the caliper and frame are designed for, that would be the bare minimum required to determine whether it's even slightly possible that a transplant won't be rejected.
So in one hand I have a broken rear disc brake in the other a functioning front disc brake.
If I use a smaller rotor can I get this brake to work on the back?
I've got lots of various mounts too...