w98seeng

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

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FBinNY 

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.

laura*

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.

jccaclimber

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.

w98seeng

Holy crap, you're right. I used a magnifying glass and can see the Allen key insert.

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

jccaclimber

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.

w98seeng

Oopps, too late.

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

Ian

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reptilezs

cassette looks beat, peened over teeth tips

w98seeng

That doesn't answer my question though.

laura*

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?)

bradtx

I have a HG90-8 (12-21) that's identical in appearance to your cassette.

Brad

bradtx

Where'd you get your info, Laura?

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

Brad

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.

bradtx

Thanks, Laura.

Brad

Jeff Wills

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.

w98seeng

Thanks for the info everyone.

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