I've got an old Raleigh road bike. Recently I have noticed, that there is an odd sound comming from the rear of the bike when I input more power. The sound resembles a sound, which is made by not fully shifted gear, though the gear is in the right position. Oiling everything did not help.
I have noticed, that the rear wheel wobbles a little to the sides (a small diagram in , where red represents forks, bold black is a tyre and blue shows how the wheel wobbles).
has anybody suggestions what to do? I have never experienced problem like that. Thank you.