Replacing the bearings is part of a hub service. Of course, it may not help the chirip. Still, less expensive than a new hub by a lot of pennies. Grin. Also, when you stand and pedal or coast, does it still chirip? If not, it’s not the hub. Does it speed up as you do, slow down as you do? If not, not the hub. Saddle? Tighten pedals? Crank arms loose or cracked? Dry/stuck link in the chain? All kinds of possibilities. Grin. Good luck finding it!
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