paul – hmmmm, the guy at the shop made me start thinking it was something else just coincedence, but my bikes been absolutly silent since at least june last year, then i had goosed bearings in the back, (which were making a hamster wheel type noise only, no clicking), now 1st ride i had straight after the bearings were replaced and there it is, its almost like a ping/clicking noise when climbing
it is pretty annoying, it did seem a little quiter at weekend generally, but it was still there and as soon as i got near a techy steep sort of climb it was there all the time
could do with trying another wheel really, but typically its not as easy as that, as im on xx1 freehub
EDIT : andy, could be i do tend to wash mine alot, but no more than this time last year, and never had this noise before, plus like i said there was no noise like this prior to the new bearings fitted hmmmmm!