Originally Posted by
w98seeng
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.