I have been told that my chain and sprocket are on the way out because the chain has alot of slack in the middle but really tight on the rear sprocket. Does this sound right? If this is the case, how do I know what chain is right? I know the sprockets because it has the teeth number engraved into them. Is there any indicater on the chain? I am hoping to be able to avoid the mechanic labour costs but I don't have the tools to do the change, and booze is cheaper then buyer or going to the mechaincs. So is anyone south brisbane to gold coast area willing to assist?