I'm replacing the housing on my ride... I"m seeing deraileur housing at 4mm and 5mm. Current stuff is 5mm. I've heard that 4mm will shift a little faster and cleaner, but I have to wonder if the stuff will fit in my frame's housing guides. Anyone able to shed some light on this for me? Does it shift cleaner or should I just stick with the 5mm stuff?
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Thread: housing ... 4mm or 5mm?