The ceramic vertebrae thing, I have seen on weightweenies..... boy oh boy $$$$$.
Nokons + Powercordz = price of the vert's by theirself. if you idle on ebay long enough you can find a full set of brake + derailleur nokon housings for under $100. Powercordz are expensive no matter how you look at them... BUT the weight savings are nice compared to buying a new cassette or whatnot.
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