So, left the house today cycling to my local trails. After a couple of hundred yards I could hear a strange sound. The best way to describe it would be as though you were holding two spokes (that aren't attached to a wheel!) and gently tapping them together.
I stopped, thinking I'd snapped a spoke, and checked both wheels. Both running true and the tension in all the spokes is fine. I checked the brakes for the pads rubbing but nothing there.
It's very intermittent and continued through the ride. Just a "tss tss tss" sound as though someone was touching two long,thin bits of metal together.
Any thoughts?