Losen your back wheel pull it back to words the bak of the bike make shore the wheels strete and not tuching the framekep pulling it back and you will c that the chain is tight wile your holding the wheel bak as far as it gose then ask a perant or sum1 to tighten the wheel bolts
hope that helps...
Have to loosen back wheel use some kind if wedge with the bike upside down put the wedge between the frame and tire pull on the wedge and after it feels tight tighten the nuts back on the wheel just make sure tire is straight before u tighten
Disregard my 1st question I now see what modle of bike this is.
Your problem is with your limit screws on the deraileur. There should be 2 srews on your dearailuer; these screws limit the travel of the deraileur so it will not push the chain off. I can't tell you which screw adjusts which limit because deraileurs are different from one another; but I can tell you if you figure out which screw adjusts which limit you screw it in until the chain doesn't shift off the gears. Be careful if you adjust the screw in too far you will not be able to hsift to all your gears.
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Sometimes all it takes is a master link or "quick link," but you can't count on that. How to fix it depends on several factors. There are different chains for the various number of cogs/gears on the rear of the bike, and an older chain may require a different procedure than a newer one. Further, if the chain is badly worn it may need to be replaced, but then may not mesh well if the gears aren't replaced as well. Finally, just taking out the rest of the link (one full link is one outer and one inner) may make the chain too short, which could damage the bike.
It's best to take the chain and bike into a bike shop, or a bike co-op if there's one available. If you really want to know all the in's and out's see this link: Chain Maintenance
Bicycle chain tip. The chain breaker tool is the one tool that will pay for itself. Chains break off at times for no apparent reason. Keep it with you when biking, as it can also help another stranded cyclist.
on all single speed bikes, it has been my experience, that chain tension is the reason for the chain to come off, try tightening it again, since this seems to keep happening the chain may be stretched out now and replacing the chain and getting it tight should solve the issue.
Count the cogs, duh. You're going to need some help even after you know if it's 6-, 7-, 8, 9- or 10-speed in the rear. Special tools and 'how-to' knowledge. Take it to a Bicycle Shop an experienced DIY cycling friend.
Chains usually fall off because the chain is not tight enough. With the bike sitting upside down on the seat and handle bars the nuts on the rear axle should be loosened and the axle moved rearward so the chain tightens. When it is tight the nuts can be tightened. In addition to having a tight chain the rear axle nuts adjust the alignment of the wheel to the frame. You know you have it right if both the chain is tight and the tire closest to the crank is centered in the frame. The nuts should be tight enough so they don't allow the axle to move when you ride it. I hope this helps.
Being a physical problem and lacking any clues about the bike we'll need you to observe and judge what is really happening to make the chain fall off. Use a search engine for "bicycle chain falls off" to get some ideas and guidance on identifying the dysfunction, then the fix(es).
Does the rear wheel go on such that you can adjust it to take any play out of the chain? If so, turn the bike upside down or put it on a bike stand. Loosen the back wheel and pull it so that the chain is tighter and then tighten the wheel. There are other possible causes but I suspect this since you recently removed the wheel. Also I'm not sure how often the chain falls off. If this doesn't work, ask again and let us know how often its coming off. Good luck!