• With Dt Swiss the extra lenght is 1mm thread per 2mm of lenght. That's leaves you with 2mm extra thread on 16mm nipples.
    Sapim is just extra lenght of nipple which is good if building current crop of carbon rims with extra thick spoke bed.
    The picture above is a little dated perhaps. If a the spoke is fully threaded
    Into a 12mm nipple it actually protrudes about a mm over the nipple end. With 14mm nipple the end of the spoke sits flush.with a 16mm nipple there is still enough spoke to support the weak portion of the nipple.

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