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Folding Bikes Discuss the unique features and issues of folding bikes. Also a great place to learn what folding bike will work best for your needs.

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Old 05-06-14, 10:10 AM   #1
Jaclyn34
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Birdy Bike - 8 speed- Chain falls off upon folding.

Hi, I purchased a used older birdy and when I fold it, the chain pops off. The rear deraileur is very worn, however the bike shifts just fine. Also, it does not have a chain guard..would this help? How do I prevent the chain from coming off. Also, I'm having trouble placing the front tire, when I fold it. It seems bulky. Any advise is appreciated. It rides nice, but my main issue is the chain falling off upon folding.

Thank you
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Old 05-06-14, 10:19 AM   #2
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Old 05-06-14, 10:21 AM   #3
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Old 05-06-14, 10:34 AM   #4
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I see a loop thing attached to the bottom pulley bolt that some Birdy owners made or bought.. to pull up the extra slack of the rear fold

*a chain minder inside, and a disc chain-guard may help, up front.



I don't own one of those bikes .. I used them, * .. made other pieces for my bike Friday , which folds to pack

they keep the chain from un shipping off the 2 chain-wheels, 1F,1R, of my IGH with a chain tensioner ..
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Old 05-06-14, 10:44 AM   #5
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The newer birdy has a chain tensioner help keeping the chain from falling off. Is there one on your rear derailleur?
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Old 05-07-14, 12:55 AM   #6
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Quote:
Originally Posted by Jaclyn34 View Post
Hi, I purchased a used older birdy and when I fold it, the chain pops off. The rear deraileur is very worn, however the bike shifts just fine. Also, it does not have a chain guard..would this help? How do I prevent the chain from coming off. Also, I'm having trouble placing the front tire, when I fold it. It seems bulky. Any advise is appreciated. It rides nice, but my main issue is the chain falling off upon folding.

Thank you
Chain: I am referring to the newer Birdy but perhaps the older ones are similar enough. The Birdy comes with a chain guard on each side of the chainwheel that aids in keeping the chain on. Also, there is a bracket just above the chain at the chainwheel which also aids in keeping the chain on.

The derailer comes with a stiff wire loop shape that gathers the chain when folding the rear under. This keeps the chain under some tension and also aids in keeping the whole together. The gears need to be shifted to the smallest cog at the back before folding.

The front wheel is held in folded position by a screw on the inside of the fork near the top. This screw presses against the tyre and keeps it in folded position. If the tyre is a bit too fat, it would simply press against that screw instead of moving in next to it. The remedy is to loosen the nut that secures that screw, screw it in a bit deeper to accommodate the tyre, and fasten the lock nut again. The screw head should lightly interfere with the tyre, allowing it to move in beside it while pressing against the tyre.
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Old 05-07-14, 10:52 AM   #7
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Thank you all for the tips!

Thank you for the information. I do not have a chain guard on the birdy, and nothing above the chainwheel to secure it either. Also, I did not notice a screw to secure the front tire upon folding, but I will look for that.

Do you recommend any alternative deraileur? The one I have is worn and so are the grip shifts.

Thank you

Jaclyn
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Old 05-07-14, 12:22 PM   #8
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Have a good look at recent and current Birdies to get some ideas on appropriate equipment.
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