Originally Posted by canklecat

check the spoke crossings, especially on the rear wheel. Pinch them together where they cross. If you hear any squeak or feel unusual friction or stiction, that's probably the source.

i get that with only one wheelset, the black spokes on my hybrid. I moosh some wax between the spoke crossings every month or so. Soft wax from scented candles works better than oil or grease for me. Maybe those wheels have a delicate romantic side, i dunno.

A few months ago i chased down persistent squeaks for weeks on that bike, eventually overhauling the hubs, bb, and checking everything else. But it was just the spokes.