I replaced the 8 speed cassette (Shimano) on an old wheel with a 9 speed cassette (ZTTO).

However, the lockrings seem to be different sizes, in 2 ways:

• The old 8 speed lockring had a shorter threaded part - ie. you would have to screw it in less to be all the way in, than the 9 speed lockring
• The old 8 speed lockring had a larger face plate, which on the 9 speed cassette actually blocks some of the teeth when the chain is on the 11 cog.

If I use the new lockring that came with the 9 speed cassette, the cassette is loose, because the longer threaded part means the lockring doesn't screw in far enough for the face plate to make contact with the cassette.

But if I use the old lockring that was on the wheel until now, I can't shift to the 11, since that's blocked by the larger faceplate.

What should I do here? Are there different lockrings I could buy? Or should I put a spacer behind the cassette, to push it further out and let me use the lockring with the longer threaded part?

I replaced the 8 speed cassette (Shimano) on an old wheel with a 9 speed cassette (ZTTO).

However, the lockrings seem to be different sizes, in 2 ways:

• The old 8 speed lockring had a shorter threaded part - ie. you would have to screw it in less to be all the way in, than the 9 speed lockring
• The old 8 speed lockring had a larger face plate, which on the 9 speed cassette actually blocks some of the teeth when the chain is on the 11 cog.

If I use the new lockring that came with the 9 speed cassette, the cassette is loose, because the longer threaded part means the lockring doesn't screw in far enough for the face plate to make contact with the cassette.

But if I use the old lockring that was on the wheel until now, I can't shift to the 11, since that's blocked by the larger faceplate.

What should I do here? Are there different lockrings I could buy? Or should I put a spacer behind the cassette, to push it further out and let me use the lockring with the longer threaded part?

Images (red is the new one):