BA: 3t Discus C35 Pro Wheelset : Ebay : follow up thread

Alek

What happened exactly?

I've found (the hard way) that both hubs required tightening but were running just fine after this.

There is a counter-clockwise locking screw around the axle on the rear, on the freehub side, that likes to get undone and loosens the freehub so pawls may disengage. If you were riding like this it may be damaged, but there is a chance that the freehub just needs to be reinstalled and the locking screw tightened. You can also put a thick o-ring between it and the QR cap, to stop it from becoming undone.

Hopefully this makes sense

boomdocker

Alek - what you describe seems like exactly what happened..

Doing hill intervals on grassy bank, first thought I was spinning out - so once I realised I wasn't, figured it was the freehub
And my conclusion was that somehow the pawls had disengaged - so i'd say you're right

I can;t see the locking screw you mention though, where is it exactly?

Alek

When you remove the cassette, it's directly under the lockring. Looks like a black, rounded, hexagonal or square-ish nut that sits on the axle.

boomdocker

mmm

don;t see anything apart from the end cap which pulls off by hand? Don't see anything to tighten?

see photo at link below

https://www.dropbox.com/s/rf06jzs3ori5img/media-share-0-02-04-000df9304948df66c86373c78c599dc638ea6e815ef06ab24dcd74f5564b615a-4912bffc-dae3-4cc5-af2f-88c89f8f8dea.jpg?dl=0

Alek

Can't see the dropbox link at work, but it sits just behind the end cap...

Ok, found something:

Alek

You should be able to reach and tighten it with flat pliers. Mind it tightens counter-clockwise!

boomdocker

Ok - thanks - I'll keep looking

boomdocker

Thanks Alek - looks to me like that may be missing - perhaps that's my problem

Alek

How is the frehub staying in place then? With this bit removed, it just slides in an out the axle on my wheel...

boomdocker

well it's not - thats the problem - i can pull the freehub about 5-10mm out by hand

Does the part you are talking about cover the bearing? I can see the bearing when I look down on the hub

Alek

Yup. Good luck finding the spare part

On the other hand, I can imagine you could replace it with a nylon / alu / rubber tube that would fit over the axle and connect the end cap with the freehub. A little play there should be ok, at least to my DIY-engineering brain

Otherwise, I'll be happy to get the broken wheelset of you for a symbolic half price you've paid :P

Alek

This is the freehub locking ring, visible after the cassette lockring and end cap is removed:



Also, I use a piece of rubber between this ring and the end cap, to prevent it from loosening. Its just a random yoke from the parts bin, even a rubber band will work.




If the freehub is loose even when this ring seems to be tight, check the axle locking ring on other side of the hub!

boomdocker

Thanks!

boomdocker

So....

Having stripped, cleaned and lubed and re-assembeld the hub three times, with the same syptoms re-appearing each time, with the help of a buddy finally figured out what the problem was..

So it appears that the teeth insert has broken its bond with the hub shell and is turning - apparently a known problem with some Mavic hubs

So the hub is f***ed after 4 races....

I'm going to try to get a replacement from 3T , but given the purchase history, probably a long shot - so looks like a rebuild job.

Alek

Ah bugger... Sorry to hear. If you are going to replace the hub, can I have dibs on the broken one?

boomdocker

Yes Alek, I'll keep you posted

Note, the hub is perfect, it's the hub shell that's the problem..