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Chances are it's one nipple that's loosened about 1/4 turn.
If you can spin it, stop it (using the brake) at the offending point, then check inside the rim for the offending nipple, you'll probably be able to true it with a flathead screwdriver.
If it doesn't work, or you bottle it, take it to a mech, but if you sort it, you've saved yourself a trip.EDIT: Ignore! Forgot that although it's a fairing disc, there aren't really any methods of determining whether a given nipple/spoke goes to NDS or DS without prior knowledge of the wheel/rim.
EDIT EDIT: The offending nipple/spoke could be identified by counting around (clockwise from valve hole, viewed from DS) using an image of a HED C2 rim/Ardennes wheel (same rim used on disc IIRC) for reference. Looking at most wheels on their website, the first spoke viewed from this angle goes to NDS.
Lukas-
Yeah good idea.
It is proberly one nipple a tiny bit lose.
I could find the right spot and just make a small change ona nipple mark the nipple with something so I know which one I turned. If better great, of not better undo and try again.Or just find better things to do than mess with it for .5mm.
And given I can't find one of my assignments due in, i have a lot more pressing issues!
skinny
hmm
I dunno. I'll see. That kind of thing bugs me, when it could be perfectly true.
I'd have to take it to someone, no way I could true it perfect. I know my weaknesses.