When I peddle the chain and the gears move but the rear wheel does not. This started while I was riding. have never had this happen before. The bike is less than a year old, did not cost much, and is inside when not in use.

Any time a chain comes off it means there's slack in it or something's not tight enough. Not looking at your bike, I would have to guess that you need to loosen the bolts on the back wheels and then pull the wheel assemblies back until the chain is tight. This is probably a two person job, one to unbolt and bolt and one to apply tension. That being said, many years ago I remember bikes my friends used had a problem where if they were riding at a good speed and then stopped peddling to coast, then slightly reversed peddling, then started fast peddling again, that they would throw a chain. I think what was happening was they were creating slack in the chain by coasting, slightly reversing their peddling, then starting again. The chains were also slightly gummed up, allowing slack at this time.

If this is a coaster brake bike (single speed, no hand brakes) then the problem might be inside the rear wheel hub. If that is the case then you can only fix it by completely dis-assembling the rear wheel hub - or it might be simply that the chain is slipping, which would not happen unless the chain is too loose which would be indicated by the bottom of the chain hanging down too low. However, if this is a multi-speed bike, then it could be that the chain and rear-wheel cogs are worn - which can be fixed by replacing the freewheel and the chain - however, it takes a lot of use or rust and dirt before that level of wear happens.

very likely that chain links not "fitting" cog teeth . if both chain and cogs are brand new, then skipping should never happen. more often than not, a repair would require both new chain and new rear cogs, and possible new fron t chain wheel. all depends which item are worn. I would probably get a new chain firstly, then see if this fixed the problem. nigel

If its only happening when moving and your feeling vibrations in your feet. Check your chain is not to tight. You could also have worn chain and sprockets. If not that then check rear wheel bearings and rear brake pads for heavy ware.

This happens when the back wheel is not aligned properly with the chain. As the wheel turns the chain is being pulled to one side causing it to slip to the next set of cogs. To solve the problem first you need to loosen the wheel by opening the 2 nuts on the axel. If the chain slips inwards towards the wheel you need to move the front part of the back wheel to the left from a view point behind the bike. If it slips outwards away from the wheel then you need to move the front of the back wheel to the right as viewed from behind the bike. When the chain and cogs of the rear wheel are lined up in a straight line the problem should be solved.

There may be some chain links that do not move freely. turn the pedal slowly backwards and check for siezed links, as it goes through the deraileur.

A worn chain can do this as well, unfortunately you usually have to change the chain and sprocket cluster as a pair. If you just put a new chain on a similar problem can occur.

You have the bike in a high gear. Assuming it is a deraleur type, look to see which sprocket the chain is riding on. If it is one of the smaller sprockets (on the rear wheel, not the pedals), put it onto a bigger sprocket by changing gears to one of the lower gears. As a side note, professional riders change gears many, many times during one outing. They keep the pedal speed at a comfortable speed no matter how fast or slow the bike is going. Anyhow, to review, put the bike into a low gear, particularly when starting out from a stop. If the bike makes a wierd clicking sound, or the gears don't change as they should, it is possible that your indexing in your gears needs some adjusting, or there is some other problem. Any bike shop will take care of you, as these are very easy to fix.

You may have a locked up wheel bearing or you may have an object stuck in the chain. Can you spin rear wheel by hand? If not, most like bearings, if so, then you may have bent gear tooth or something stuck in chain. Check derailer to make sure it is not bent

If your chain is still on the rear gears and the front gears on the crank and pedals to easily you have to switch gears into a combination that gives you more resistance. If you are unable to do this while riding, have someone hold the rear of the bike off the ground while you turn the crank and change the gear. You will generally want something in the middle of the rear gears and the second largest on the front to start.

The bike is 6 months old, or the chain/sprockets? Either way, sounds like you need a clutch.