11t vs 12t cassette lockring differences?

[Sleeping Menace]

I'm hoping someone can clear this up for me.. I've been tinkering with bikes for >30 years, but have never run into this specifically....

changing from a 12-25 cassette, down to an 11-23, apparently requires a different lock ring? How is this possible? It's threading into the same hub, .. or am I missing something. Further... if the lockrings ARE different..does this mean that there's a difference in the hubs on which you can put a 12t 10-speed cassette, vs one on which you can put an 11t?

Forgive me in advance this sounding inane as a question..but it's not making much sense to me..

Thanks in advance.

........................
http://anotherdooratthe.endoftheinternet.org

Cycle related blog entries, including a few 5 minute reviews:
http://anotherdooratthe.endoftheinternet.org/category/cycling/

 

[adscrim]

Yes, you need an 11t specific lock ring. the outer diameter of the 11t lockring is simply smaller, a 12t lockring won't let the chain sit properly on an 11t cassette end. The threaded section is the same size.

Did the 11-23 not come with an 11t lockring?

 

[Sleeping Menace]

Yes, you need an 11t specific lock ring. the outer diameter of the 11t lockring is simply smaller, a 12t lockring won't let the chain sit properly on an 11t cassette end. The threaded section is the same size.

Ok.. great.. appreciated..
so do I understand then that you could use an 11t lockring on a 12t cassette? or no?

Thanks again

........................
http://anotherdooratthe.endoftheinternet.org

Cycle related blog entries, including a few 5 minute reviews:
http://anotherdooratthe.endoftheinternet.org/category/cycling/

 

[timtak]

Yes, you need an 11t specific lock ring. the outer diameter of the 11t lockring is simply smaller, a 12t lockring won't let the chain sit properly on an 11t cassette end. The threaded section is the same size.

Thank you. I never knew. And in case anyone is wondering...

The one at the top is for 12t smallest cogs and the one at the bottom for 11t smallest cogs. There seems to be a disadvantage to the smaller lock-ring in that it has less flange, only part of the flange has locking zigzags and since using a 12t smallest cog I have not experienced loose cassette which happened quite a lot when I used 11t cogs. Since I hardly ever need the 11t cog, except downhill or with a tailwind, I may go back to the bigger12t smallest cog and large 12t lockring.

The smaller lock-ring is from a 11 speed cassette whereas the 12t large lock-ring is from a 10 speed cassette but that does not seem to make any difference.

 

[Gunk]

I’ve you’ve ever tried swapping over Campagnolo cassettes you realise that a lock ring is not always a lock ring

 

[Ajax Bay]

THIRTEEN years later . . . the 'new' (in the scheme of things) 'similar threads window (below) has a lot to answer for.
Using a 11t lock ring on a cassette which has as its smallest sprocket a 12t is less secure. To do so is either carelessness or a temporary fix.
For the other way round, see @adscrim's post #2 ^^^: still as valid today as it was two decades ago.

 

[gbb]

I’ve you’ve ever tried swapping over Campagnolo cassettes you realise that a lock ring is not always a lock ring

I was just coming to that, iirc, the 11t is a combined sprocket and locking?

 

[Dogtrousers]

"Similar threads" does have a lot to answer for but it's not all bad.

I'll file this away for future reference and if ever I find that a cassette lock ring doesn't seem right, I'll have this to fall back on.