Check your chain - sounds like a very dry chain. Does it have frozen links? Try to over lube the chain in that case and let the lube it sit for a while to get into the rolls. Then wipe everything off. You may have to do this a couple of times the get it lubed thoroughly.
Also check the wheelbearings..
Or could it be a piece of rock stuck between a brake pad and the rotor? (The rotor is on the right hand, though...)
Last edited by anders55; 06-24-2014 at 01:42 AM.