Rides Majestic
Join Date: Jan 2013
Location: Westfield, MA
Posts: 1,339
Bikes: 1983 Univega Gran Turismo, 1970 Schwinn Super Sport, 2001 Univega Modo Vincere, Self-Built Nashbar Touring, 1974 Peugeot U08, 1974 Atala Grand Prix, 1986 Ross Mt. Hood, 80's Maruishi MT-18
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I don't think anybody suggested this, but you don't have to run full length housing to the derailleurs. A clamp on cable stop on the down tube below the head tube and another near the bottom bracket would shorten the housing considerably and reduce friction. You may need a chainstay guide also. It shouldn't cost much to procure the guides, a good LBS should be able to source them without much problem.
They also make top tube clamps for the rear brake housing. It's not uncommon to run full length houzing to the brakes. The clamps will really do a lot to neaten up the cabling too.