Originally Posted by
Greyryder
Sounds like you need a cable hangar, that let's you a length of regular brake cable as the straddle cable. Maybe something on
this page will work?
No a hanger won't help.
On a
Mixte frame, the rear brake is attached to the central stays. This avoids the cable routing issues that a seat stay mount causes. But there's never enough room for the cable so SOP if for the yoke to be looped around the seat tube as the OP described. The hanger is integrated in a bridge typically about halfway up the central stays.