Campagnolo Zonda making a rather funny sound!

gary_sparrow
gary_sparrow Posts: 181
edited July 2018 in Road general
Anybody got experience of a strange noise from these wheels ?
Picked up a new set recently and they make a strange wind /turbalance sound at certain times and speeds . Not sure what it is . The wheels seem perfect . They are new out of the box but have noticed it on the 3 spins I’ve done
Now I’ve had these before , the same c17 model and never heard anything bar the freehub sound . This is not about the free hub sound as such . It’s really like an intermittent wind sound that comes on about 20mph It’s reasonably loud too.
It’s coming from the back wheel only .

Any ideas ?