Campagnolo cassette compatability

Just have purchased myself a Campagnolo Record 10sp laced to Open-pros with a view to fitting an 11sp cassette however the one I have doesn't fit, the freehub is just too short. Now I am stumped by this as I understood Campag 9-11 cassettes are all the same width. The seller chacked the Campag website and its says they are compatible.

Now at my last service the LBS rather annoyingly fitted a Miche Campy 11sp cassette, is this the difference? Would a Campagnolo cassette fit? But then I don't get how the Miche cassette was compatible.

I am very confused: it should fit.

Anyone care to enlighten me?

Edit: this is the cassette I have

You mean you're trying to fit the Miche cassette to a Campag 10 freehub and it's too long?

Yep. Is that a no-no? Must it be Campagnolo?

In theory it should be exactly the same. How big a gap is it and are you using the original lockring?

Here are the tenth and eleventh sprocket. The tenth sprocket is maybe a mill beyond the free-hub body

1 Attachment

The freewheel body is the last in this page: http://branfordbike.com/articles/cassettes-and-cogs-pg60.htm

These are the hubs: https://thecycleclinic.co.uk/products/campagnolo-record-hubs-with-shimano-yes-or-campagnolo-freehub-body-32h-36h

Everything tells me they should fit, but they don't. Must be because forrin

Check your cogs/spacers-i bet you've a couple the wrong way around. I've a vgc chorus 11 cassette if you want to try a Campag one. £40 shipped? Think it's 12-25.

I'll have that cassette anyway, ta muchly. I took it to the LBS as I didn't have the right tool and they said it didn't fit. However after carefully putting it back on by hand I was able to get the final sprocket to just grip, and then tightened the lockring by hand and its gripping now and not slipping, even without any torque. Annoyed the LBS made a pig's ear of it and sent me away feeling like a muppet. There's an Evans around the corner, going to pop it in there tomorrow, get them to check and tighten it.

Phew, thought I was taking crazy pills there for a minute

I was even comparing the two free-wheel bodies by eye and going on to my brother how they were exactly the same length, 'go on, you look, you look, see?'. Reckon it may have occurred because a non-mechanic did it (my mate Giles) who I told that the hub was 10sp and the cassette was 11sp but should fit, I reckon he tried it once, it didn't fit and he didn't persevere because he didn't know they 100% should be compatible.

Well the spacers have one or two with sided flanges and are designed to fit a certain way-if they're out of sequence or reversed you don't really notice but they're not sitting flush to the base of the cog so that would be my first port of call before getting an Evans mechanic onto it. Either way you want the small cog sitting tight to the freehub or else you might strip the lockring threads.

Welcome to the cassette, I'll dig it out of my heaving parts bin for pics but might not be able to get to a post office till later in the week tho.

Don't know about the miche cassette but the Campag one will fit perfectly. That's the same free hub that's fitted to all upper end Campag wheels from Zondas to boras an hyperons etc.

The Miche spacers by eye don't have any variation but there may be one there. Careful re-assembly seems to have done the trick so it's me (shambolic amateur mechanic) 1, LBS (50 years in the trade) 0. I'll pm you about the cassette, in no hurry to get it as the bike needs a service and new BB bearing cups.

Many thanks for the help

As I understand campag 9,10 and 11 should fit on the same hub. There wasn't a spacer fitted behind the sprockets was there?

Not that I can see, there are stops at the base of the free-wheel splines the sprockets sit against.

I had a similar issue with Campagnolo 10speed and Hunt freehubs the solution was to get a lower profile lock ring, and torque to the 42nm (which is actually quite a lot). It compressed everything and worked. Just.

One rule - clean everything before you assemble - an accumulation of small bits of grit etc on the surface of the sprockets and the spacers is enough to make it look as if the cassette isn't going to fit. Also - if the lockring hasn't been done up tight enough in the past and especially if a 10s cassette has been fitted, you'll find little "notches" in the splines where the sprockets have fretted against them - they can stop your (11s) sprockets from moving down the splines cleanly and may "stop" them in "not quite" the right places as the 10s spacing is different to the 11s.
The recommended torque is 40nm to compress the spacers correctly to give accurate spacing, to prevent movement and to ensure adequate support for each sprocket from the spacer to reduce the risk of sprocket fracture - so yes, it is "quite tight" but it's also required ... we see lots of problems with cassettes, cassette bodies / freehubs on Campag, Shimano and Campag / Shimano pattern bodies from other makers because of exactly this issue.

Interesting you say all of that: I inspected the free-wheel body quite closely and noticed the pitting on the splines and ran my nail along them, scratching at grit and those notches as you call them. I think you might have hit the proverbial nail on the head, this was why the cassette didn't originally fit. Going to get it to a mechanic to double check and torque it properly

Finally got the thing fitted, took three trips to bike shops all told, the second one just said it wouldn't fit, didn't even bother to try to tighten it, then admitted they didn't know a lot about Campag. The third, Mud Dock, I explained everything, said it is compatible, the mechanic was uninterested, told me my problem was fitting a 11 speed cassette to a 10 speed wheel, I said I know, he said 'what do you want me to do'. I said 'tighten it' at which he rolled his eyes and said why didn't I just say that to start with. Not great on the customer service there, plus arse-clenchingly expensive, a colleague took his road bike there for a service and they charged £270.

However one of the shop boys took an interest in my Razesa so we got chatting about it, so I was able to ignore the mechanic when he returned with the properly torqued and fitted cassette.

Thank you all for listening.

The third, Mud Dock, I explained everything, said it is compatible, the mechanic was uninterested, told me my problem was fitting a 11 speed cassette to a 10 speed wheel, I said I know, he said 'what do you want me to do'. I said 'tighten it' at which he rolled his eyes and said why didn't I just say that to start with.

Hah. Amazing.