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Thread: suntour VX rd

  1. #1
    Ride More seedsbelize's Avatar
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    suntour VX rd

    Beyond all of the things which aren't technically correct with my particular set-up, I have a couple simple questions relating to derailleur function only. The first is this: Suntour Cyclone & Cyclone GT Cages c.1980 In the top view, what is the purpose of screw # 23? I came around to this in trying to figure out why the derailleur itself is making so much noise--seems unrelated to the obvious chain issues. I could be wrong, of course. In my case it's a Suntour VX, but the screw in question is the same.
    Thanks


    http://www.businessinsider.com/malco...ception-2015-2
    The real beauty of this play, aside from the fact it was made by my favorite team, is that it was perfectly executed. The receiver ran a perfect route; Wilson threw a touchdown pass, and the defender played his part perfectly. A thing of beauty.

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    Retro Grouch onespeedbiker's Avatar
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    It appears to be the cage stop; it is used to keep the cage spring under tension.
    Chiunque tenti di scappare a queste regole dovrà mangiare un piatto largo di polenta vecchia di tre settimane e sarà schernito per questo, soprattutto se è straniero

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    Bianchi Goddess Bianchigirll's Avatar
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    I believe its only function is to act as a stop for the cage plates.

    Bianchis '87 Sport SX, '90 Proto, '90 Campione del Fausto Giamondi Specialisma Italiano Mundo, '91 Boarala 'cross, '93 Project 3, '86 Volpe, '97 Ti Megatube, , '90 something Vento 603,

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    billy chuck eschlwc's Avatar
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    that's the one you unscrew first when overhauling any derailleur to remove all cage spring tension.

    it's always a pain for me to reinstall it. a magnetic screwdriver helps a lot.

    i didn't know it was removable the first time i ever overhauled my first derailleur, a campy nr one. i tried everything i knew to return tension to the spring with that stop screw still in place. it's essentially impossible, even using a vise and pliers. several bloody thumbs later, i turned to the advice of bike forums.

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    Retro Grouch onespeedbiker's Avatar
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    Quote Originally Posted by eschlwc View Post
    that's the one you unscrew first when overhauling any derailleur to remove all cage spring tension.

    it's always a pain for me to reinstall it. a magnetic screwdriver helps a lot.

    i didn't know it was removable the first time i ever overhauled my first derailleur, a campy nr one. i tried everything i knew to return tension to the spring with that stop screw still in place. it's essentially impossible, even using a vise and pliers. several bloody thumbs later, i turned to the advice of bike forums.
    Yes, but the derailleur comes apart without removing the stop doesn't it? Even though I knew about removable stop I had one in a Nuevo Record that was stuck, so I tried for about an hour to install the cage. Finally I made a tool where I could use more force than a screw driver and it worked.
    Last edited by onespeedbiker; 02-21-15 at 07:35 PM.
    Chiunque tenti di scappare a queste regole dovrà mangiare un piatto largo di polenta vecchia di tre settimane e sarà schernito per questo, soprattutto se è straniero

  6. #6
    billy chuck eschlwc's Avatar
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    ^ to fully overhaul any derailleur of this vintage type, you first remove the stop screw.

    if you try to separate the pully cage from the body without first removing the stop screw (which will then allow the release of pully spring tension), the spring will snap, and you may not later know the exact notch the spring was in originally (if there are more than one). it's nearly impossible to recharge the pully spring and reassemble the derailleur with the stop screw in place. it's the first to unscrew on disassembly and the last to rescrew on assembly.

    a pully spring snapping your thumb in surprise attack is not fun.

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    Senior Member DiegoFrogs's Avatar
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    I agree. The last thing you do is rotate the cage by hand and re-install this stop-screw to return the cage to tension. The tuning of the tension comes from selecting the notch where Spring 20 fits into Shaft 21.

    The whole system is a massive pain on the GT derailleurs where Shaft 21 is also the pivot for the guide pulley.

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    Senior Member jethin's Avatar
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    +1 to all above. Another q: if using one of these without the deraiileur hanger do you still attach nut #6 to the derailler mount bolt?

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    Ride More seedsbelize's Avatar
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    ^^ I read somewhere that you do; I unfortunately don't have one easily at hand.


    http://www.businessinsider.com/malco...ception-2015-2
    The real beauty of this play, aside from the fact it was made by my favorite team, is that it was perfectly executed. The receiver ran a perfect route; Wilson threw a touchdown pass, and the defender played his part perfectly. A thing of beauty.

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    Senior Member DiegoFrogs's Avatar
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    Quote Originally Posted by jethin View Post
    +1 to all above. Another q: if using one of these without the deraiileur hanger do you still attach nut #6 to the derailler mount bolt?
    No. If your frame is equipped with a Campagnolo-style integrated derailleur hanger, then it is the threaded piece that replaces that nut. Assuming your mount is a threaded Campagnolo style, that is.

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    Senior Member jethin's Avatar
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    Quote Originally Posted by DiegoFrogs View Post
    No. If your frame is equipped with a Campagnolo-style integrated derailleur hanger, then it is the threaded piece that replaces that nut. Assuming your mount is a threaded Campagnolo style, that is.
    OK, I'll buy that. The reason I asked is b/c at first glance it seemed like that the mount bolt might be too long without that nut for a threaded dropout.

    Another thing to note about the VX rd: on mine the jockeys (including the dust caps) are specific to their position (guide or pulley). If you mix 'em up they may not turn smoothly.

    Not to highjack, but one more q: I'm in need of a barrel adjuster for my VX. But it seems that it uses a smaller diameter than a "normal" size brake adjuster. Does anyone know if this size adjuster is commonly available?

  12. #12
    Ride More seedsbelize's Avatar
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    Hijack away


    http://www.businessinsider.com/malco...ception-2015-2
    The real beauty of this play, aside from the fact it was made by my favorite team, is that it was perfectly executed. The receiver ran a perfect route; Wilson threw a touchdown pass, and the defender played his part perfectly. A thing of beauty.

  13. #13
    billy chuck eschlwc's Avatar
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    Quote Originally Posted by jethin View Post
    Another thing to note about the VX rd: on mine the jockeys (including the dust caps) are specific to their position (guide or pulley). If you mix 'em up they may not turn smoothly.
    great point. and i wish i had read your post a month ago. i overhauled one, mixed up the wheels, and on reassemly, one of them wouldn't turn. took way too long to figure out what happened. i had never run into that particular quirk before with an rd.

  14. #14
    billy chuck eschlwc's Avatar
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    i'm having a problem getting my v-series to swing freely in the on-frame hanger with the hanger bolt tightened down.

    if any of you have any quick tips ...

  15. #15
    Senior Member jethin's Avatar
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    Quote Originally Posted by eschlwc View Post
    great point. and i wish i had read your post a month ago. i overhauled one, mixed up the wheels, and on reassemly, one of them wouldn't turn. took way too long to figure out what happened. i had never run into that particular quirk before with an rd.
    im glad to know that I'm not the only one who's done this. I figured it out after a couple of frustrating hours... this morning.

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