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I know SRAM X9's are MTB hubs, but for £150 could these be that much of a bad idea?
X9 hubs are 'OK' - they are reliable. They don't have the best pick-up despite being MTB hubs and they have a weird design that makes pre-load adjustment difficult. The freehubs are steel though and can be replaced.
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Are you running 10 or 11 speed?
If 11 speed, the X9 only go up to 10 speed, not much choices in the MTB section unless you go for something like the Hope hubs whose freehub body can be changed for 11 speed (or go for a road/cx disc wheelset, like the Hunt, or Kinesis).
IMHO, the Crest/Hope wheelset is the best bang for weight and durability, especially on a featherweight such as yourself, min tyres I recommend is 28mm which look exactly a 23mm tyres on a wide road rims.
Like @Brookly_Bay I have (well, soon will have) a Croix de Fer and I'm after some fairly light, tubeless ready disc wheels with wider (25mm+) rims.
I'd prefer hand built really and am thinking about Pacenti SL25's or CL25's and Novatec hubs.
But this groupset on Planet X is stupidly cheap and has the CL25 rims:
http://www.planetx.co.uk/i/q/WBPACL25X9/pacenti-cl25-32-hole-rims-on-sram-x9-hubs
I know SRAM X9's are MTB hubs, but for £150 could these be that much of a bad idea?