Hey T�n�r� addicts!

In the last couple of weeks I noticed that my handlebar gets unsteady/starts wobblying around on motorways (120km/h). I'm not sure if it has something to do with vibrations in general (but it wasn't always so on motorways!) or maybe my wheels are out of balance or I get a bend in the rim somewhere or the tyres... I don't know... Or is it simply time to change the headset bearing? I've got 22000km on my clock...

Any ideas?

Thanks! Much appreciated.

Cheers, Mike