Join Date: Apr 2007
Location: Munising, Michigan, USA
Bikes: Priority Bicycles Eight
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FWIW, I've been running 5mm Jagwire housing with 1.1mm Jagwire derailler cables.
My recollection is that 4mm housing would work just as well. I remember being confused about the whole 4mm / 5mm thing at first too. I finally went with 5mm just to be consistent with the size of my brake cables. That way I had to buy just one size ferule.