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  1. #1
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    Shimano Deore M591 SGS Rear Derailleur Long 9 SPD Help

    Looking for some help from the knowledgeable members on this forum regarding this rear derailleur. This is advertized as 9 speed cog compatible but does anyone know if I can use a basic chain with this? I'm referring to the chains used on 1980's 10-12-18 speed bikes with a 6 speed freewheel, or does it require a more narrow chain?
    Thank you

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    I'm not familiar with the width of the pulley section on that derailleur but why use a 9 speed derailleur at all if you're on a 6 block in the rear? Even if the chain will pass through the pulley assembly the narrower width would make shifting very twitchy, would tend to overshift.
    There's no such thing as a routine repair.

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  3. #3
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    I'm open for suggestions and options. I have friction shifters with a triple crank in the front, 6 speed in the back, with a chain wrap total of 37.
    Prefer not to go the used route. Thanks

  4. #4
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    http://sheldonbrown.com/harris/derailers-rear.html Shimano 105 long cage also works 39t wrap. RD-5701-GS

    Friction can use any derailleur, but as I noted probably best to get one designed for fewer cogs. I'll admit I'm out of the loop a bit on recent equipment but I believe derailleurs designed for 8 speed and below would work
    Last edited by cny-bikeman; 03-08-14 at 03:24 PM.
    There's no such thing as a routine repair.

    Don't tell me what "should" be - either it is, it isn't, or do something about it.

    If you think I'm being blunt take it as a compliment - if I thought you were too weak to handle the truth or a strong opinion I would not bother.

    Please take the time to post clearly so we can answer quickly. All lowercase and multiple typos makes for a hard read. Thanks!

  5. #5
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    Last edited by Al1943; 03-08-14 at 03:28 PM.

  6. #6
    Senior Member Retro Grouch's Avatar
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    If it was my bike I'd try it. Rear derailleurs guide the chain from the center so I doubt chain width matters much if any.
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  7. #7
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    That is true - unless the pulley cage is too close to the chain pins, and there might be less play in the pulleys as well. Again, I don't have first hand experience, but I certainly would not buy the 9 speed without assurance it will work. Perhaps ask the merchant you intend to use. If you get assurance and it does not work you can return it. But better to get something more certain to work.
    There's no such thing as a routine repair.

    Don't tell me what "should" be - either it is, it isn't, or do something about it.

    If you think I'm being blunt take it as a compliment - if I thought you were too weak to handle the truth or a strong opinion I would not bother.

    Please take the time to post clearly so we can answer quickly. All lowercase and multiple typos makes for a hard read. Thanks!

  8. #8
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    Quote Originally Posted by Al1943 View Post
    Yep - that looks better than what I suggested - reasonable prices.
    There's no such thing as a routine repair.

    Don't tell me what "should" be - either it is, it isn't, or do something about it.

    If you think I'm being blunt take it as a compliment - if I thought you were too weak to handle the truth or a strong opinion I would not bother.

    Please take the time to post clearly so we can answer quickly. All lowercase and multiple typos makes for a hard read. Thanks!

  9. #9
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    My medium cage 9s Tiagra had chain rub on its cage in some gears whose chain line isn't bad when I used a 7/8s chain. Works fine with a 9s chain. Some say the rule of thumb is to use a chain designed for the narrowest of your RD, FD, and crankset.

  10. #10
    Senior Member Bill Kapaun's Avatar
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    If you have friction shifters, you have the ability to trim the RDER to keep it centered regarding the chain.
    I think you'll be OK, but it'll be just a little "fussier" to prevent chain rub.
    You can use 9 speed chain though.

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    Thanks all. I called the merchant. According to the fella I spoke with, it would work. So I'm still checking and looking at different RD's but it's good that this is another viable option. Appreciate all the responses. Thanks again.

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    Hummmm...now I see the responses about chain rub. Maybe I should have specifically asked that question.

  13. #13
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    I did come across this statement about this RD - 9 speed bicycle derailleur will work on 8 and 7 speed systems. This does imply it should work fine.

  14. #14
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    I would just try to find older Shimano RD for your setup. I know for sure that 9 speed RD will work just fine with 9, 8, and 7 speeds. I think 6 speeds older chains may be little different and you may or may not have some issues with it. Check http://techdocs.shimano.com/techdocs/index.jsp . You may find some good info in their documents.
    I woould just use older Shimano Tourney for your application. Its around $12-$14 at your LBS...
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    Dont use 7s chain or 9s cassette

  16. #16
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    I think that a 7-speed RD would stand a better chance of functioning well than a 9-speed. And based on the OP's wrap capacity needs, and possibly big cog size needs, a mountain type RD may be the best choice.

  17. #17
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    I'm intent on picking out an RD this weekend. It's interesting... I found the chain width spec's.
    My chain varies between 7.3-7.5mm at the post. A 9 speed derailleur may be asking too much. Although, looking at a 0.040"/1.2mm, the span doesn't look like too much.


    • 6 speed - 7.8mm (all brands)
    • 7 speed - 7.3mm (all brands)
    • 8 speed - 7.1mm (all brands)
    • 9 speed - 6.6 to 6.8mm (all brands)

  18. #18
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    You would need a 9 speed chain as they are different from 6/7/8 speed chains.

  19. #19
    cycles per second Gonzo Bob's Avatar
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    It will work. I have a Deore MD510 SGS 9-speed rear derailer and I run 7-speed with a 6/7/8-speed chain. The current 6/7/8-speed chains are narrower than the "old" 6-speed chains. When I first got my 6-speed roadie in 1986, it came with Uniglide chain that was kinda noisy and didn't shift that well so when it wore out, I switched to the narrower Sedisport. The width of that Sedisport is what most 6/7/8-speed chains are these days.
    Last edited by Gonzo Bob; 03-11-14 at 04:02 PM.

  20. #20
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    I run a 9 spd 105 rear on my daughter's old Schwinn with 6/7/8 speed chain on six indexed cogs without issue.
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