Could be: Bottom bracket lockrings Crank bolts Chainring bolts Hub locknuts Pedal axle seals Wheelnuts Saddle Seatpost clamp Saddle clamp
Basically just check everything that might come loose and tighten it.
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Could be:
Bottom bracket lockrings
Crank bolts
Chainring bolts
Hub locknuts
Pedal axle seals
Wheelnuts
Saddle
Seatpost clamp
Saddle clamp
Basically just check everything that might come loose and tighten it.