I have a relatively new Boardman Pro 29er. It has around 500 miles on it.
I'm having a sound issue at the minute where at certain speeds a very loud resonating vibration type sound starts. I'm convinced it's coming from the crank or bottom bracket but can't be sure. It almost sounds like a loose guitar string.
It seems to be related to cadence more than actual moving speed. I'd say roughly 60rpm.
I've inspected my bike with my fingers for loose nuts and bolts, cable ends rubbing, cables rattling and I can find nothing.
What could it be?