John Wayne Toilet Paper
Join Date: Feb 2006
Bikes: BH carbon, Ritchey steel, Kona aluminum
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It could be a loose headset. To check this, hold the handlebar with your left hand on the front brake and your right hand (fingers) touching where the fork meets the frame. Rock the bike forward/backward on the brake and feel with your fingers for relative motion between the fork and frame.
It could be a loose hub bearing. To check this, pick up the front of the bike with one hand and grasp the wheel/tire near the top. Move the tire side to side to see if it has relative motion at the hub-to-axle interface.
It could be a loose presta valve nut. To check this, first of all, if you have presta valves (not the same kind of tire valve as a car), see if there is a little knurled nut on the valve and if it's snug up against the rim.
It is very doubtful that your spokes 'rattle'. If they did, your wheel would be a floppy loose disaster that you could barely even ride.