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I got a folding bike 2 months ago and got my first hiccup. It has a 3-speed hub gear and while changing gears today, it seems like the chain slipped off the smaller chainring near the back wheel into the gap with the wheel. As the chain is quite tight, my basic knowledge or Youtube info on how put chains back on in dérailleur bikes is useless.

How do you actually slide it back on? Is there a simple technique? I tried simply pedalling but it doesn't seem to make a difference.

If this matters, it's an S-RAM iMotion hub gear.

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You may not have had enough chain tension. Solution is probably to loosen hub nuts, slide wheel forward to get the chain back on the sprocket, and re-tighten hub nuts with appropriate chain tension. –  Jason Brown Mar 20 '14 at 17:38
You should first put the chain on the rear sprocket, then pedal it on to the front one. This way it's easier. –  Alexander Mar 20 '14 at 23:10
The chain is actually quite tight now, I can barely move it and I don't see immediately how to take it off the front sprocket. Any possibility to do this without tools? Thanks for your input by the way. –  Kurt Mar 21 '14 at 15:11
Get it of the front sprocket by pulling it to the right while turning the sprocket forwarth. It should come of. Now put the chain on the back sprocket. Get the chain on the front sprocket again by pushing it back on a very small part of the sprocket and turning the sprocket so that it will 'pick up' the chain. If your chain came of, it will might have been to lose as Jason Brown said. –  Foxhill Mar 26 '14 at 16:17

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