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  1. #1
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    Birdy modification problems

    Hi, I modified my Birdy 9speed monocoque (bought 2007) using Joseph Kuosac parts with work done by my local bike store. I changed the wheels to their carbon wheels with Kojak tyres, changed from a nine to a 10 speed capreo cassette (9-28) and a 56T chainring. The derailleur was changed to a long travel 105 with a 10 speed tiagra shifter. The bike is great to ride and much faster now BUT the gearing and derailleur are awful. The long travel derailleur almost touches the ground. The shifting is sort of awful as well, it shifts down well but shifting up it skips and slides. Any helpful suggestions? I was wondering about changing to a MTB short travel derailleur and matching shifter.

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    Before you go changing the rear derailleur again try to make sure that your rear derailleur is on the same parallel plane as the rear wheel/rear sprockets (you can use tool like, Derailleur Hanger Alignment Gauge to do this. Or go to your LBS to have them do it :-)

    HTH,
    awdnut

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    Thanks. This is how low it sits
    Attached Images Attached Images

  4. #4
    jur
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    Quote Originally Posted by ninox View Post
    Thanks. This is how low it sits
    From that pic, it seems to me that a fair few chain links can be taken out. That will get the derailer up higher and may improve shifting as well.

    However, any bike mechanic worth his salt ought to be able to get the shifting right.

  5. #5
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    Quote Originally Posted by jur View Post
    From that pic, it seems to me that a fair few chain links can be taken out. That will get the derailer up higher and may improve shifting as well.

    However, any bike mechanic worth his salt ought to be able to get the shifting right.
    Thanks. I know a bike mechanic worth his salt and will take him the bike.

  6. #6
    Part-time epistemologist invisiblehand's Avatar
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    Quote Originally Posted by ninox View Post
    Hi, I modified my Birdy 9speed monocoque (bought 2007) using Joseph Kuosac parts with work done by my local bike store. I changed the wheels to their carbon wheels with Kojak tyres, changed from a nine to a 10 speed capreo cassette (9-28) and a 56T chainring. The derailleur was changed to a long travel 105 with a 10 speed tiagra shifter. The bike is great to ride and much faster now BUT the gearing and derailleur are awful. The long travel derailleur almost touches the ground. The shifting is sort of awful as well, it shifts down well but shifting up it skips and slides. Any helpful suggestions? I was wondering about changing to a MTB short travel derailleur and matching shifter.
    If the largest cog is 28T going to a MTB short cage rear derailer will make things worse, all things equal. I would change to a short cage (SS) shimano road derailer just to get more clearance.
    Checking for a bent derailer/hanger is not a bad idea. I typically change the hanger by sticking a allen key into the derailer's mounting screw and eyeball it. Simply looking straight down at the derailer and cogs will give you a good idea whether the derailer is bent. Although I think a bent derailer (generally) results in symmetric problems.

    How old is the housing and cables? Maybe you should -- or have a mechanic -- reconsider the routing and thoroughly grease the cables to get a smoother action. How old is the shifter and derailer?

  7. #7
    coprolite fietsbob's Avatar
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    The long travel derailleur almost touches the ground.
    actually the cage length is for chain slack take-up, reduce the amount of chain length difference

    with just one chainring, and a 9-26t cassette you can use a short cage RD..

    (Big+big )-(small+Small) is the slack difference in tooth counts.

    [and if a 2nd chainring at all , keep the difference small.. say a 48-56..]

    (non birdy owner)
    Last edited by fietsbob; 04-21-14 at 03:34 PM.

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    jur
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    If you look at this pic of my Birdy you can see the chain is also on the biggest cog on the back but that the derailer is a fair bit higher. This is due to a shorter chain. With the Birdy there are some things which are critical to the success of the rear derailer function: Chain as short as possible, derailer must have a long cage, or the chain won't be gathered adequately when folding.

    The shifting problems sound like the cable adjustment must be increased, ie screw the barrel adjuster so the cable housing gets longer.
    Last edited by jur; 04-21-14 at 02:31 PM.

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    jur
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    Here's another view, not in lowest gear unfortunately, but I remember clearly I had to make the chain as short as possible. That is a long cage LX.
    Last edited by jur; 04-21-14 at 09:49 PM.

  10. #10
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    How old is the housing and cables? Maybe you should -- or have a mechanic -- reconsider the routing and thoroughly grease the cables to get a smoother action. How old is the shifter and derailer?[/QUOTE]
    Thanks. It's all brand new - cassette, cable, derailleur, shifter.

  11. #11
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    Hey that's very helpful jur and thanks for the pic

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    Senior Member bhkyte's Avatar
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    Changing to twflon coated inner gear cables can solve alot of upshifting issues in my experience.
    I often add a pen spring also at the end of the cable.
    Dual drive Mezzo (GOLD), Dual Drive Mezzo with bullbars (black), White Brompton thingy with Dahon Androes stem and bull bars. Birdie (old sytle) 7 speed. Downtube NS8. Birdie red.

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    coprolite fietsbob's Avatar
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    derailleur must have a long cage, or the chain won't be gathered adequately when folding.
    wonder if the sort of widget Bike friday makes , a finger like piece, which bends over the chainring

    so the folded chain slack
    gets taken up there, as well as at the RD,, it is clamped around the BB shell


    adding :it'sa DIY fabrication project now, but, the 3 pulley shorter cage ... for ground clearance ,

    but 3rd pulley for chain wrap ... is re making a Design the Sun Tour RD Used to make ..
    Last edited by fietsbob; 04-23-14 at 06:41 AM.

  14. #14
    jur
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    Quote Originally Posted by fietsbob View Post
    wonder if the sort of widget Bike friday makes , a finger like piece, which bends over the chainring

    so the folded chain slack
    gets taken up there, as well as at the RD,, it is clamped around the BB shell
    I think I have seen this solution somewhere in a photo originating in Asia.

  15. #15
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    Here is an update. I took the bike to my LBS. And they could not make it shift nicely. It shifts horribly. We shortened the chain. We adjusted the tension. It shifts horribly. It seems that the problems are in the cassette. The cassette does not appear to rotate completely true. Also the new crankset is also slightly out of alignment. So perhaps its a problem with the parts. Options now include:
    1. Change the capreo free hub to a standard free hub and put on a standard road 10 speed cassette.
    2. Take off this new 10 speed cassette and the new derailleur and new shifter and return to standard 9 speed Capreo
    3. Find an alternate vendor of 10 speed capreo cassette (but I am unsure who makes this - anyone?)
    4. Make a 10 speed capreo cassette with a 10 speed ultegra or 105 and the bottom parts of the capreo cassette.

    Welcome any thoughts.

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    jur
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    AFAIK, the Capreo is only made in a 9-speed, by Shimano. So that 10-speed version is a custom job, right? So it is possible that various cogs have been put together without due regard to the hyperglide matching. Especially shifting to bigger cogs would be problematic. Each cog has a shifting gate that sits aligned with the next bigger cog's chain pickup edges. This is why the cogs have a smaller gap in one place, to make sure these items are aligned on the freehub. If a shifting gate does not have chain pickup ridges next to it, shifting can be crap.

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    jur
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    I wonder if Capreo has been discontinued by Shimano. I can't find any info on their site. Perhaps it is not a good idea then to go with Capreo if it is obsolete? This is actually the main reason I have stayed away from this product.

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    kuosac 1.jpgkuosac 2.jpgkuosac 3.jpgkuosac 4.jpgkuosac 5.jpgkuosac 6.jpgkuosac 7.jpgkuosac 8.jpg
    Quote Originally Posted by jur View Post
    AFAIK, the Capreo is only made in a 9-speed, by Shimano. So that 10-speed version is a custom job, right? .
    Yes, its a Joseph Kuosac 9-28 Capreo based cassette. They make wheels and lots of aftermarket stuff for small wheel bikes. They do a 10 and an 11 speed cassette for a capreo free hub. I have the 10 and its nothing but misery so far . I have a feeling there is a simple solution somewhere and have written to them for help. Let me post a photo of the cassette. Here is a photo of the shortened chain as well showing the derailleur a little higher.
    Last edited by ninox; 04-22-14 at 04:37 AM. Reason: add photos

  19. #19
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    Chain round the wrong way?

    chain 1.jpgchain 2.jpg

    I notice the chain says LF on the right side of the bike - its a 10 speed tiagra chain (HG4601) which is apparently directional. Is this chain round the right way and if not how much would that affect shifting?

  20. #20
    jur
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    The chain is directional yes, but it looks to be fitted correctly. The writing is supposed to be on the outside. At least that's the way with the Ultegra chain.

    So the sprocket is machined out of one billet... No possibility of mismatched cogs then. One would assume that they know where to put the gates and the pickup ridges.

    Maybe a SRAM chain would work better. The Shimano ones are quite special.

    Take the chain off and eyeball the derailer, that it aligns exactly with the intended cog in each gear. (I spent many hours just this weekend fixing bad shifting; somehow the supposedly matched XT shifter over-reached the derailer such that alignment was not perfect over all cogs. I modded the derailer quite a bit to fix it.)

  21. #21
    The Recumbent Quant cplager's Avatar
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    Quote Originally Posted by jur View Post
    AFAIK, the Capreo is only made in a 9-speed, by Shimano. So that 10-speed version is a custom job, right? So it is possible that various cogs have been put together without due regard to the hyperglide matching. Especially shifting to bigger cogs would be problematic. Each cog has a shifting gate that sits aligned with the next bigger cog's chain pickup edges. This is why the cogs have a smaller gap in one place, to make sure these items are aligned on the freehub. If a shifting gate does not have chain pickup ridges next to it, shifting can be crap.
    I believe Utah Trikes (among others) offers a 10 speed version as well. From the feedback I've gotten, they shift well.

    That being said, I wouldn't otherwise dismiss your concerns. Mixing 9 and 10 speed cassettes in general does sound like a recipe to have a poorly performing drivetrain.

    Quote Originally Posted by jur View Post
    I wonder if Capreo has been discontinued by Shimano. I can't find any info on their site. Perhaps it is not a good idea then to go with Capreo if it is obsolete? This is actually the main reason I have stayed away from this product.
    Ummmm.... Really?

    Let me google that for you

    Second hit.
    http://Charles.Plager.net
    http://RecumbentQuant.blogspot.com

  22. #22
    coprolite fietsbob's Avatar
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    As an OEM buyer Bike Friday would know, , Not Sure if I came across Caprio on the Shimano website in the past years
    while it was in sales mode.. but then again I never looked that hard , since I dont have much intrest..
    Last edited by fietsbob; 04-22-14 at 11:01 AM.

  23. #23
    Senior Member smallwheeler's Avatar
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    oh, my..
    canfield micro drive hub..




  24. #24
    Nobody mconlonx's Avatar
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    Quote Originally Posted by ninox View Post
    Here is an update. I took the bike to my LBS. And they could not make it shift nicely. It shifts horribly. We shortened the chain. We adjusted the tension. It shifts horribly. It seems that the problems are in the cassette. The cassette does not appear to rotate completely true. Also the new crankset is also slightly out of alignment. So perhaps its a problem with the parts. Options now include:
    1. Change the capreo free hub to a standard free hub and put on a standard road 10 speed cassette.
    2. Take off this new 10 speed cassette and the new derailleur and new shifter and return to standard 9 speed Capreo
    3. Find an alternate vendor of 10 speed capreo cassette (but I am unsure who makes this - anyone?)
    4. Make a 10 speed capreo cassette with a 10 speed ultegra or 105 and the bottom parts of the capreo cassette.

    Welcome any thoughts.
    Should be easy enough to mount up a standard road 10sp cass to check things out.

    If the cassette does not appear to be completely true, it could be the freehub body which is the issue, not the cassette. Again, mounting a standard road 10sp cass should make this apparent or not.

    Finally, we had issues in the shop adjusting early run Tiagra running gear until we were told by Shimano Tech to swap out cable housing ferrules from plastic to metal.

    Good luck!
    I know next to nothing. I am frequently wrong.

  25. #25
    Part-time epistemologist invisiblehand's Avatar
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    Quote Originally Posted by jur View Post
    I wonder if Capreo has been discontinued by Shimano. I can't find any info on their site. Perhaps it is not a good idea then to go with Capreo if it is obsolete? This is actually the main reason I have stayed away from this product.
    I just had this conversation with another bud from Australia. So you're not alone Jur.

    Long story short, Capreo is still available here in the US. Bike Friday and the Harris Cyclery folks both say that there has been no shortage or word of its demise.

    The best part ... now that 9-speed is passe, the cassette is dropping in price.

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