shutdown

Left work today and suddenly I hear an almighty squeaking noise coming from back wheel area.

It's a real oily (or lack of) squeak and not a brake squeak.

Is there a quick fix for this as I don't think there's going to be time to get it fixed for the rideout on saturday!!

take into this that I know nothing about repairing bikes so taking things apart is probably not going to happen.
I'm concerned about it locking up if its a bearing or something whilst going to/doing the rideout