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  1. #1
    Senior Member KLW2's Avatar
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    Shimano specs for Mountain LX

    I have a mid/late 80s Univega mountain bike with a Shimano Mountain LX RD. I'm trying to find out if it can handle a 34 tooth rear cog..anyone know where I could find spes or info?
    Thanks
    Keith

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    I don't have any catalogs showing that exact name. Can you post the RD number found on the back of the derailleur?

  3. #3
    Uff Da!
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    Isn't LX part of the Deore group? I would look for Deore LX and see if you find anything. It may depend on the year. I know that some older XTR rears will only handle up to a 32t cog while the newer ones will handle 34t.

  4. #4
    Senior Member KLW2's Avatar
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    Quote Originally Posted by T-Mar
    I don't have any catalogs showing that exact name. Can you post the RD number found on the back of the derailleur?
    On the back it's marked RD M452, it's a long cage RD

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    RD M452 - GS (Long Cage) up to 30T
    RD M452 - SGS (Super Long Cage) up to 32
    Minimum rear sprocket is 13 for both.
    The GS will handle up to 36T difference Fr/Rr, SGS = 38T.
    Please don't ask me how to tell the difference between GS and SGS.
    Some models actually have min and max sprocket sizes stamped on the der. somewhere.
    Hope this helps.

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    Um, I think you can tell the difference between GS and SGS by the inner plate (I don't mean length, although if you had one of each that would certainly be a help), The inner plate on the GS has what looks like a small round hole up near the guide pulley. The SGS has a kind of upside down curved teardrop shaped cutout in the same spot.
    At least that's what it looks like in the spec sheet I have.

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    I just found it, but I see that MalcolmsFrejus beat me to it. Often, these ratings are on the conservative side. Sometimes you can squeeze out in a couple of extra teeth. 34T may work, but you'll have to try it to be sure. However, don't try it on the road or trial, without first trying it on the stand, under low load, where you can closely examine the action and ensure it can handle the extra capacity.

  8. #8
    Uff Da!
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    To expand a little on what T-Mar said, if the cage plates contact the largest cog when shifting to that cog you can sometimes shorten the chain by a link which will rotate the cage more and prevent it from contacting. If you have horizontal dropouts you can also play with axle position in the dropouts and gain a little more range. If you shorten the chain be sure to check the large-large ring-cog combination to see if there is enough chain for it. You know you are going to shift into it accidently sometime and you don't want to ruin your expensive rear der.

  9. #9
    Death fork? Naaaah!! top506's Avatar
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    Quote Originally Posted by Sierra
    Isn't LX part of the Deore group?
    There were also Exage LX comps. The 500LX FD that I put on the Triplecross solved ALL by front shifting issues.
    Top

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    Quote Originally Posted by Sierra
    Isn't LX part of the Deore group?
    Quote Originally Posted by top506
    There were also Exage LX comps.
    The funny thing was that when I found the model number in my catalog, it was listed as Exage Mountain. No mention of LX in the description, which explains why we were having a hard time finding it. It appears Shimano may have made a running change during the production year (i.e. specifications subject no change without notice).

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    Quote Originally Posted by Sierra
    To expand a little on what T-Mar said.....
    Thxs. Now if his derailleur gets mutilated, it's off of my shoulders. Seriously though, it was an excellent technical explanation. We all appreciate it.

  12. #12
    Senior Member KLW2's Avatar
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    Wow! Thanks everyone! I really appreciate all the information. I will take some close up pictures in the next few days and post you can have a reference.
    Keith

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    Senior Member KLW2's Avatar
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    Photos didn't turn out but it is labeled Mountain LX on the front of the paralleagram, on the back plate of the paralleagram it is stamped RD 452 on the first line of text then Shimano on the next line then VIA Japan on the last line of text, then NA off to the left side of the rest of the text.
    On the back side of the front plate of the leg (cage?) it has the letters SGS just behind the upper guide pulley it also has the curved hole. It is all silver in color except the front side of the parallelagram which is black with silver letters labeling it MOUNTAIN LX.
    Thanks again for all the information!

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    Quote Originally Posted by T-Mar
    The funny thing was that when I found the model number in my catalog, it was listed as Exage Mountain. No mention of LX in the description, which explains why we were having a hard time finding it. It appears Shimano may have made a running change during the production year (i.e. specifications subject no change without notice).
    I think this is right. I have a Panasonic race bike from the late 80's, and it is fitted with sport LX components. Except the brakes, which are Exage sport. I think the names must have changed mid way throught the season. Love the small hand edition levers

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    I have a couple Mountain LX's hanging around. I'll check model numbers tomorrow.

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