Hello All,

The bike: A 90's "Balance" brand mountain bike with no suspension and a basic 3x7 setup. Ridden daily, I have added fenders and a rack.

On Friday, it rode as usual.

On Saturday, it started making a whoosh/rub noise intermittently, but it would only start after being ridden for a bit. The noise really sounds like the front fender rubbing, but I inspected both fenders and tires and saw no evidence. I removed and reset the front fender to be sure. The front tire was a bit low, so I pumped it up.

Sunday and today: The sound persists, and now there is an intermittent wobbling feeling. For about 15 feet at a time, it feels like SOMETHING is wobbling left to right, then it stops.

Neither wheel is significantly out of true, and there is no play in the axles when pushing side to side. The headset bearings have no play, but the bottom bracket cartridge has a very small amount of sideways movement. Neither QR skewer or lever was crooked or loose.

So, assuming that the noise and wobble are connected, anyone have any bright ideas?