Could it just be that the hanger needs to be tweaked? We've had some issues with EdgeRunner cargo bikes that come with 20" rear wheels and long cage derailleurs. Takes a bit of work,but in the end we get them working properly.

I presume they dont all do this. The one I have issues with is an older red. Newer bike sorted?
My others have narrower tyres or IHG.

I presume they dont all do this. The one I have issues with is an older red. Newer bike sorted?
My others have narrower tyres or IHG.

Thanks for the information. IHG is tempting... I am really contemplating swapping the derailleur for a short cage for now than to source for a IHG wheel. Actually the largest cog is 32T and it seems unless I change the cassette, I have to use medium cage? I can't find information on how much shorter is medium cage.

[QUOTE=Winfried;18305271]This one from Pacific Cycles:
http://bikeforums.net/attachment.php...hmentid=487022

QUOTE]

Hi Winfried Thanks! Do you know if this still works if I change to a smalle chainring?

No idea. I'll let the experts answer.

BTW, what's the point of using a long cage derailleur instead of a short cage? On the Birdy, the derailleur is dangerously close to the ground :-/

I don't know if medium cages exist. I use the short type with larger cogs.
I don't see why a smaller chain ring would make any difference to the functioning of the chain tensioner.
The long cage on a birdie is to keep the chain tension in folding to stop it coming off when folding. I changed to a short cage to get more ground clearance. This reduces the amount of sticks caught in the toggle gogs, I bought the large cogged rear mech so the chain turn was wider to reduce jamming. Seems to have worked well. Shimano Alturus mech.

So a short cage + chain tensioner solves the problem?

Yes short cage minimises debris stuck in rear transmission. Reduced to same level of problem as my mountain bike. Solves cleareence issue with 2 inch wide big apple tyres catching rear mech.
Yes chain tensioner keeps chain on when folding 99% of the time.
I realise not all disraillered# birdies may have issues with rear mechs catching wide tyres.

# keeping up snafus tradition of mispelling this word.

Yes, it does exist. I'm running a Sram X9 medium cage derailleur on my Yellow Birdy.

I have tried short, medium, and long cage derailleurs on Birdy bikes. The medium cage derailleur doesn't have any issues if your chain is the right length, and you are running taller tires. When I ran the long cage derailleur the cage reached to the brake surface of the rim, and could catch things on the ground if I wasn't careful. I like to run a mountain bike rear cog on my Birdy as it makes climbing the steepest hills quite easy, and pulling a trailer with my daughter in it. I am running and XTR cog with a 34 tooth ring.

I now run a medium cage XTR derailleur with a set of 20" wheels, and have no worries, there is plenty of ground clearance. I run Panasonic slicks, which are quite narrow, but with 20" wheels the cage isn't going to come close to the tires anyway.

For a tensioner, I found a spring-loaded parallelogram type which bolts around the bottom bracket, with a jockey pulley just below and behind the chain wheel, it works perfectly. I couldn't easily fit the original tensioner to the new XTR derailleur, so I needed another option.

Was it a difficult process to convert the bike for 20" wheels?

Jim

No, it was not difficult. There is no real "conversion" necessary, the wheels bolt on and fit with no clearance issues. The only modification necessary is to the brakes, the bosses are are not in the right spot. There are two options for the brakes, the simplest one is to use brakes with pad adjustment slots long enough for the pads to center over the rim, or to use offset adapters.

The bike is noticeably faster with 20" wheels, and the ride is more stable, but the bike does not fold as compactly, though it setill easily fits into a Birdy bike bag.

Thanks for the detailed reply. I may need to try this.

Any specific things I would need to know before purchasing 20" wheels? Also any chance you could post a picture of the bike with the 20" inch wheels.

Jim

Hi, will the size of tire for the 20" affects the fold? I tried with 20x1.25 and it seems the tire get squeezed a little before the rear arm can fold. Was wondering will fatter tire affect and also if the tire pressure is higher will it fold at all? Thanks!

20" must be running with out mudguards?

Anyone who wants to talk and share about Birdy Bikes can also join us on our new FB group as well:

https://www.facebook.com/groups/1649726268626764/

Birdy Global Community ...

https://s-media-cache-ak0.pinimg.com...65e5bc8b03.jpg

Any issues swapping out the stock wheels for 20" (406) on the disc brake Birdys?

Birdy 2016 new catalog ... (Pacific Cycles)

http://bikeforums.net/attachment.php...hmentid=501996

Some photos I took this bike show, birdy III

http://bikeforums.net/attachment.php...hmentid=509253http://bikeforums.net/attachment.php...hmentid=509254http://bikeforums.net/attachment.php...hmentid=509255http://bikeforums.net/attachment.php...hmentid=509256http://bikeforums.net/attachment.php...hmentid=509257http://bikeforums.net/attachment.php...hmentid=509258http://bikeforums.net/attachment.php...hmentid=509259http://bikeforums.net/attachment.php...hmentid=509260http://bikeforums.net/attachment.php...hmentid=509261http://bikeforums.net/attachment.php...hmentid=509262

And a trip to Colorplus Service Center afterward (birdy upgrade expert).


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I've just bought a Birdy Blue with the SRAM dual drive. I think this is last of the old frame in pale blue. My question is, is there a trick in folding this bike? At the moment when the front wheel swings around, it hits the clickbox and because it doesn't fold in tight enough the handlebar does not have enough room to drop down past the main frame.
So at the moment, it is folding into a big mess of parts!
Thanks :-)

Can you attach a picture of the bike, folded as far as your can get it? It will be easier to help if we can see what's going on!

As you can see, the fold isn't great......


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