All my cable housings are standard brake housing. The rear brake passes through guides a bit loosely but has no problem with moving. It is almost a straight run to the rear brake noodle, so not much tendency to shift. The gear housings are supplied by Rohloff - similar standard brake housing and a touch loose in the guides. The Thorn Nomad has stainless steel cable guides to ensure any movement that will rub off paint will not lead to corrosion.