The lightest, most elegant and most functional cable hanger in the world. The Compass René Herse rear cable hanger is held in place by the seatpost binder bolt. Make sure your slot is at least 2.5 mm thick (or open it up with a file) to install the cable hanger.
The cup that receives the cable housing is much smaller than usual. Strip the outer rubber cover from the end of the housing to make it perfectly. (Don’t use a ferrule!) The metal-on-metal contact reduces flex and improves brake action.