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  1. #1
    Senior Member w98seeng's Avatar
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    Identifying this cassette.

    I have a Shimano Hyperglide 8 speed cassette, 12-23, that I want to sell. There are no identifying marks on it. I checked with the Sheldon Brown website and they said that some hyperglide cassettes had plastic spacers while the Dura-Ace cassettes had aluminum ones.

    Mine has either aluminum or steel spacers. My cassette has rivets holding the cluster together. There is a thin flexible washer on the lock ring.

    Any idea what cassette this is?

    Thanks,
    Ian

    Picture 032.jpg
    Picture 025.jpg
    Picture 028.jpg
    Picture 033.jpg

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    Thaat looks more like how Sram cassettes are put together, though the lockring probably came form another source, possibly with the hub. I can't tell you the model Sram cassette, but the major differences between models is the finish and spacers.
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    Quote Originally Posted by w98seeng View Post
    Mine has either aluminum or steel spacers. My cassette has rivets holding the cluster together. There is a thin flexible washer on the lock ring.

    Any idea what cassette this is?
    If the spacers are metal, then they are aluminum, not steel.

    The "rivets" are actually bolts. They need a tiny allen wrench to turn.

    This is a Shimano cassette - notice the ramping on the back of the biggest ring - SRAM doesn't do that. You can confirm that it is Shimano by looking for the gearing codes - S, T, U, V, or W. The code for 12-23 is U.

    The shiny steel lock ring with a thin washer means HG70 (ie 105) or HG90 (ie Ultegra) level. (HG50 has a brown lock ring and DuraAce uses aluminum.) Of course, someone could have used a lock ring from a different cassette. Check the color of the cogs, they get yellower going down the group hierarchy and silverier going up.

    I don't know how to tell HG70 apart from HG90 once the circular label on the lock ring is gone.

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    HG90 or HG70. I think the HG70 is a less polished silver finish, where the HG90 is a better polished chrome, but I'm not 100% on that. They used the same shape lockring as Ultegra, so that doesn't tell us much. The price difference between a used HG70 and used HG90 shouldn't be all that different. Also, well done on the photos.

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    Senior Member w98seeng's Avatar
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    Quote Originally Posted by laura* View Post
    The "rivets" are actually bolts. They need a tiny allen wrench to turn.
    Holy crap, you're right. I used a magnifying glass and can see the Allen key insert.

    Quote Originally Posted by jccaclimber View Post
    Also, well done on the photos.
    Thanks

    I saw with the magnifying glass that there are numbers and letters on the cogs and now that I know the rivets are bolts, I'll take it apart and see what I can see.

    The chrome on the cassette is very nice. There isn't a speck of rust on it anywhere, so the chrome is well done.

    Thanks again,
    Ian

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    You may not want to take those bolts out. You can clean down between the cogs with a rag, then read the numbers/letters. If you take that apart, assuming you can get them back together in the right direction those bolts don't always thread back in nicely, and they probably have some non-reusable threadlocker on them.

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    Senior Member w98seeng's Avatar
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    Quote Originally Posted by jccaclimber View Post
    You may not want to take those bolts out.
    Oopps, too late.

    Here is a cog with the identifying numbers. Is it any help?

    Ian

    Picture 036.jpg

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    cassette looks beat, peened over teeth tips

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    Senior Member w98seeng's Avatar
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    Quote Originally Posted by reptilezs View Post
    cassette looks beat, peened over teeth tips
    That doesn't answer my question though.

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    Quote Originally Posted by w98seeng View Post
    Here is a cog with the identifying numbers. Is it any help?
    This confirms Shimano. The date code CB means March 2003. (Anyone - what year did Ultegra and 105 go 9 speed? Or more usefully, what year(s) did Shimano stop offering 8 speed cassettes in the premium groups?)

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    Quote Originally Posted by w98seeng View Post
    That doesn't answer my question though.
    I have a HG90-8 (12-21) that's identical in appearance to your cassette.

    Brad

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    Quote Originally Posted by laura* View Post
    This confirms Shimano. The date code CB means March 2003. (Anyone - what year did Ultegra and 105 go 9 speed? Or more usefully, what year(s) did Shimano stop offering 8 speed cassettes in the premium groups?)
    Where'd you get your info, Laura?

    IIRC D-A and Ultegra went 9S in '98.

    Brad

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    Quote Originally Posted by bradtx View Post
    Where'd you get your info, Laura?
    The cassette codes (STUVW) are in the Shimano "exploded view" documents. Plus on Sheldon's site.

    The date code "decoding wheel" is from a web page on the "Museum of Mountain Bike Art & Technology" site. I'm sure it is found at lots of other places too.

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    Thanks, Laura.

    Brad

  15. #15
    Insane Bicycle Mechanic Jeff Wills's Avatar
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    Quote Originally Posted by bradtx View Post
    IIRC D-A and Ultegra went 9S in '98.

    Brad
    Ditto from me- and I agree with Reptile- the cogs look toasted. It might be better off taking it all apart and turning it into a wind chime.
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  16. #16
    Senior Member w98seeng's Avatar
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    Thanks for the info everyone.

    I do agree that the cogs are used, but are they really "toasted".

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