All you have to do is wrap it around one more time.
It must be fairly tight to stay on properly and not to slap around too much.
No oil, cheap, too tight, too loose.
You should be able to move the chain up and down aprox 1/2" with your fingers.
loosen the 2 back nuts, then if you are able to pull the wheel back so that it is tight again. if that dosent work buy a chain tensiner (tightener) and take off a link on the chain then put the chain back together and chuk it bak on ya bike!
One can go to a near bike repair shop or a bike selling shop to fix a broken bike chain. In addition, one's peers might know how to fix a broken bike chain.
On either side of the rear tire, there is a nut at the back of the frame with a locking nut over top it. Loosen the locking nuts. then loosen the other nuts. pull the tire back until the chain is tight( I know this is bad, but I usually just hit the axle nut on either side with a hammer until the chain is tight. not recommended) . When the chain is as tight as you want it, tighten the screws and you're good to go. Don't pull the chain too tight though. Your rear brake will lock up. The rear break pedal should be tighter than it was before, but not so tight that you can't back the bike up. There are guides just behind the axle nut on either side that are marked. These will help you make sure that the rear wheel isn't misaligned. If you go past the arrows though, you need a new chain. You need a new chain often ( I've put 17,000 miles on my bike and I'm about to start on my 3rd chain).
they keep your chain tight
You should be able to fit two fingers between the section where the chain touches the swingarm. It should not be crushing your fingers. Adjust the chain until it isn't too loose or smashing your fingers at all. Make sure to lubricate your chain before and after every ride
Well, if you get anything stolen from you, contact the police. If it is just a bike chain, I think you can just buy another one, unless it was a very valued bike chain.
Metal,
Usually not. Some car engines use a chain for the valve timing, but it's quite different from a bicycle chain. Cars that have electrically opened doors may have a chain quite similar to a bike chain in that mechanism.
A tight one...