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I have Ultegra WH6800 rear wheel and just bought a new Ultegra 11 speed cassette CS-R8000 for it. When I put the cassette on, the smallest cog (11 tooth) goes on, but doesn't sit down all the way on the free-hub body, so the lock-ring is not fully engaged (I can tighten it up, but only about 50% of the thread are used. It sits about 2 mm higher than you would expect, which means that only about half of it is engaged n the Freehub splines. It's definitely correctly assembled, no dirt etc or obstructions at base of the splines.
What is going on - should it always sit like this?
I wondered if it was a 10 speed freehub, but I'm pretty sure those Ultegra wheels only come in 11 speed configuration (they are 2 years old). Freehub does not have a part number stamped on it
Is there a spacer sitting on the free hub?
imnotverygood - no there is no spacer
The only ten speed specific hub / wheel was the 6600 model so it's not that causing your issue.
Is the cassette assembled correctly, all the inter cog spacers the right way round etc?
steve_b77 - yes, definitely
I'd pull everything off the freehub and start again, but maybe that's just me.
https://www.bikeradar.com/reviews/components/wheels/wheel-sets/shimano-ultegra-wh6800-wheels-review/ says they are 11-speed, but anyone can write anything on the internet.
Check there's no spacer behind the cassette, an 11-34 would have had a spacer.
Maybe some cross-threading on lockring?
just measure the width of the freehub to determine if it's 10 or 11.
10 is 35mm
11 is 37mm, give or take a smidge.
n0b0dy0ftheg0at: definitely no spacer, no cross-threading and I've taken everything off, checked it and put back again at least 10 times.
This might sound daft but you have it in exactly the right position in relation to the splines? It is possible to sit the last sprocket on the freehub without the wide spline being in the correct place. It won't sit deep enough on the freehub body/in relation to the next sprocket but it will still look like it's on the freehub.
Having said that, and having swapped a couple of 11 speed cassettes this afternoon, even seated correctly, they do sit noticeably proud of the end of the freehub body. It could indeed look like about half the depth of the lock ring threads. The lockring will then nip up (some of) the gap. Maybe not completely but there needs to be a gap so the cassette is tight - and not loose because the lockring has bottomed out on the freehub.
mtbtomo - yes, everything lined up exactly right. I decided it must just be supposed to be like that, and tightened it up. Rode fine, so will leave alone now!