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  1. #1
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    Help! New dropout needed.

    I have two things I really need help with.
    Just unpacked my pristine Sun EZ Speedster AX. The ebay sellers that shipped it to me did a wonderful job of packing the bike carefully to avoid damage. It came to me without a scratch.

    My first problem: the drop out for the rear derailleur threads that the rear cage bolts into look pretty darn thin. Thread bare might be the better description. Where in the world would I find a new dropout for this bike? Looks to be the year they came out, mid-2000's maybe? It is definitely made specifically for this bike.

    Next, for the life of me I cannot figure out how the chains run through the idler under the seat. The idler is positioned within a yoke of sorts. I installed both chains on the idler wheels by threading them half round over the top of the idler. But when I did that, both ingoing and outgoing chains rub the metal yoke that surrounds the idler. I am sure I am missing something about how the chains are supposed to go. Any help from anyone please?

    And of course no, I have not contacted Sun about this. The idler is easy I'm sure but finding that exact dropout worries me. I am a newbie to bents, so I sure need help.

  2. #2
    rebmeM roineS JanMM's Avatar
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    Do you mean the derailleur hanger that the rear derailleur is attached to? Is it replaceable, which is the norm for aluminum frames? Contact info for Sun Bicycles (from their website): http://www.sunbicycles.com/contact_us.php
    Or, you could ask a bike shop about parts - any shop that uses QBP may be able to help you find stuff for Sun bikes.
    From pics of your model, looks like the upper (drive) chain goes under the idler and the lower (return) chain goes over the idler. That's all I can tell from pictures. I have no direct experience with Sun bikes.
    You might want to go to bentrideronline.com and ask in the forums there.
    RANS V3 (steel), RANS V-Rex, RANS Screamer

  3. #3
    Senior Member BlazingPedals's Avatar
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    Quote Originally Posted by JanMM View Post
    D
    From pics of your model, looks like the upper (drive) chain goes under the idler and the lower (return) chain goes over the idler. That's all I can tell from pictures. I have no direct experience with Sun bikes.
    You might want to go to bentrideronline.com and ask in the forums there.
    Yes, I seem to remember that model using an under/over idler. Power side of the chain goes under the idler, and the return side goes over. It resulted in a horrible-looking chainline (IMNSHO.) In other under/over idler setups, power usually goes on the inner idler, to keep leverage forces on the idler bolt to a minimum; but I have no idea if Sun followed the norm.

  4. #4
    Senior Member Retro Grouch's Avatar
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    Quote Originally Posted by minicoopers05 View Post
    My first problem: the drop out for the rear derailleur threads that the rear cage bolts into look pretty darn thin. Thread bare might be the better description. Where in the world would I find a new dropout for this bike? Looks to be the year they came out, mid-2000's maybe? It is definitely made specifically for this bike.
    Might not need to replace the whole dropout. There is a gizmo called a "drop out saver". It's a T-nut with the right size thread and a thin shoulder that fits on the inside. Drill out the damaged dropout slightly, slide in the "drop out saver," and you're good to go.

    I may have one in my workshop that I could mail to you but I'm not going to spend time looking for it unless I get a PM.
    My greatest fear is all of my kids standing around my coffin and talking about "how sensible" dad was.

  5. #5
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    Derailleur hanger

    Quote Originally Posted by Retro Grouch View Post
    Might not need to replace the whole dropout. There is a gizmo called a "drop out saver". It's a T-nut with the right size thread and a thin shoulder that fits on the inside. Drill out the damaged dropout slightly, slide in the "drop out saver," and you're good to go.

    I may have one in my workshop that I could mail to you but I'm not going to spend time looking for it unless I get a PM.
    Sorry guys, it is the derailleur hanger that I want to replace. It did tighten up fine this evening however. I called Sun today and they directed me to: derailleur hanger.com. They just about every type hanger known to man! Does this make better sense? The actual drop out is fine.

  6. #6
    Senior Member Retro Grouch's Avatar
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    Quote Originally Posted by minicoopers05 View Post
    Sorry guys, it is the derailleur hanger that I want to replace. It did tighten up fine this evening however. I called Sun today and they directed me to: derailleur hanger.com. They just about every type hanger known to man! Does this make better sense? The actual drop out is fine.
    It's a little bit of semantics. We're talking about the same thing. My "drop out saver" is a replacement for stripped out threads in the derailleur hanger. Since your derailleur hanger seems to be replaceable, getting a replacement makes sense to me too.
    My greatest fear is all of my kids standing around my coffin and talking about "how sensible" dad was.

  7. #7
    Senior Member BlazingPedals's Avatar
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    I suspect we're all talking about the same thing: replacing the replaceable dropout hanger. A 'dropout saver' is like a heli-coil. Replacing the hanger would be preferable, if your LBS can order one from Sun. BTW, here's a pic of an EZ Speedster:



    Along with the extreme bend in the return chain, notice that the handlebars are slightly in front of the steering axis. This will lead to twitchy-feeling steering; if you can adjust it so that it's behind the steering axis, it'll feel better. Unfortunately, you may not be able to, due to lack of space in the cockpit.

  8. #8
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    Well, after much discussion here, I bought a new chain tool, broke the chain. Installed a quick link on the inside of the chain stay and she shifts and runs through the gears just fine. The hanger seems tight so I am not going to mess with it until I can find a new one. Thanks for all the advice and thoughts!

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