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  1. #1
    Senior Member Old School's Avatar
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    MTB 9-speed upgrade

    I am replacing the stock OEM Shimano 8-speed rapid fire shifter/brake levers on my mountain bike with new 9-speed Shimano LX M580 shifter/brakes. Can I set these up for now with my 8-speed rear end until I upgrade the RD, cassette and chain to 9-speed?
    Last edited by Old School; 05-04-08 at 09:26 PM.
    Life is not a journey to the grave with the intention of arriving safely in a pretty and well-preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming, "WOW! WHAT A RIDE!"

  2. #2
    sch
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    Why not do the cassette at the same time and avoid 90% of the problem. Chain and RD
    can be changed at leisure. 8spd chain and RD should work acceptably on the 9spd
    provided the chain is not worn. For that matter, 9spd chains are inexpensive enough
    to change if there is any question of wear. Sheldon Brown's site has some discussion
    of 8-9spd compatibilities.

  3. #3
    biked well well biked's Avatar
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    There's no need to change the rear derailleur when you go to nine speed, your "8 speed" rear derailleur should work fine with the nine speed setup. The "speeds" are in the shifters and the cassette, not the derailleur. Nine speed requires a narrower chain than eight speed. So you will need a nine speed chain and nine speed cassette to go with your nine speed shifters.

    Since you're looking for a temporary solution until you get the new cassette and chain, you might try the alternate cable routing technique shown on Sheldon's site. The alternate cable routing will (more or less) alter the amount of movement of the rear derailleur per click of the nine speed shifters so that the shifters will work work with the eight speed cassette. No guarantees it will work to your satisfaction, but it doesn't cost anything to try it.

    Here's the link:
    http://www.sheldonbrown.com/gloss_aa-l.html#alternate
    Last edited by well biked; 05-04-08 at 08:53 PM.

  4. #4
    Senior Member Old School's Avatar
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    Quote Originally Posted by well biked View Post
    There's no need to change the rear derailleur when you go to nine speed, your "8 speed" rear derailleur should work fine with the nine speed setup. The "speeds" are in the shifters and the cassette, not the derailleur. Nine speed requires a narrower chain than eight speed. So you will need a nine speed chain and nine speed cassette to go with your nine speed shifters.

    Since you're looking for a temporary solution until you get the new cassette and chain, you might try the alternate cable routing technique shown on Sheldon's site. The alternate cable routing will (more or less) alter the amount of movement of the rear derailleur per click of the nine speed shifters so that the shifters will work work with the eight speed cassette. No guarantees it will work to your satisfaction, but it doesn't cost anything to try it.

    Here's the link:
    http://www.sheldonbrown.com/gloss_aa-l.html#alternate
    Thanks for the great feedback!
    Life is not a journey to the grave with the intention of arriving safely in a pretty and well-preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming, "WOW! WHAT A RIDE!"

  5. #5
    biked well well biked's Avatar
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    Quote Originally Posted by Old School View Post
    Thanks for the great feedback!
    No problem, but why the rolling eyes?

  6. #6
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    That alternate cable route thing didn't work when I tried it...though it might still be worth a try, as it only takes a minute.

  7. #7
    Senior Member Old School's Avatar
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    Quote Originally Posted by well biked View Post
    No problem, but why the rolling eyes?
    Oops, looks like I am guilty of a "forum faux pas". I just realized that smiley is labeled "sarcastic". I guess I have been using it incorrectly to refer back to the line above it. Thanks for the correction!
    Life is not a journey to the grave with the intention of arriving safely in a pretty and well-preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming, "WOW! WHAT A RIDE!"

  8. #8
    biked well well biked's Avatar
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    Quote Originally Posted by Old School View Post
    Oops, looks like I am guilty of a "forum faux pas". I just realized that smiley is labeled "sarcastic". I guess I have been using it incorrectly to refer back to the line above it. Thanks for the correction!
    I thought I gave you a pretty good summary of your upgrade, but you had me wondering if I said something offensive without knowing it-

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