Hi,

Yesterday I went riding my bike, everything seemed fine. When I got home I was walking by my bike holding the handle and I notice it was shaking while I was slowly walking with it. I lifted the front and the back while moving it and the shaking comes from the front. The wheel is rotating fine without visible movement and there's no side-to-side play. What could it be? My bike is a 2004 Giant Yukon.

Thanks

Check the headset.

https://www.youtube.com/watch?v=bHrCAdpo1Iw

a severely unbalanced wheel will also shake when ridden, despite being visibly true.

to check if this is the culprit, spin the wheel while held between your hands. youll feel a whoop whoop whoop as it rotates.

So I checked both wheel bearings front and back, everything is fine. The wheel seems to be true and I didn't hit any curbs lately to mess it up. I watched the video about headset adjustment and then a remembered something. Last week I wanted to adjust the angle of the handle, and unknowingly I adjusted it with the top headset screw...It wasn't off a lot, maybe 1 degree so I didn't forced it to much. Does this could have messed my headset bearing or something. The shaking is heavy but just visible when walking beside the bike at 1 mph. When riding the bike you can barely feel it.

Thanks