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One more thing I forget to mention; the 105 have a steel lockring, whether Ultegra have an alu lockring.
This is especially important, as if you hamfisted your lockring tight onto the freehubs, using a steel lockring on an alu freehubs body can actually strip it if you're putting too much torque to tighten it.
edscoble
Ta. Didn't realise the carrier was steel vs alu. In that case I'll go for the ultegra as they are going on some posh wheels I wouldn't mind keeping the freehub in slightly better nick for.