Mavic weirdness

[Alaskan Rover]

I've got a set of Mavic Cosmos wheels on my road bike, affixed to Mavic Cosmos hubs.

Great wheels and hubs...and they take a hell of a lot of punishnent and always stay true. But for the last few days the rear wheel/hub has been making a weird noise that I can't ascertain.

The noise sounds EXACTLY like brakes rubbing on the rim...with a periodicity of exactly one revolution as far as I can tell. Except no brakes are rubbing...I can even undo the rear brakes and still the same sound.

It's not the driveline either, as it makes the same sound coasting. It MAY be the bearings inside the cassette (Ultegra 10 speed cassette), though.

The proprietary Mavic hub bearings are sealed bearing cartridges with a alloy flange fastened to the hub with 6 or 8 very small allen screws. Looks like a big PITA to access the sealed bearings.

I ride about 200 - 250 miles a week presently and don't want to screw up a fairly expensive Mavic hub. Does this sound like a hub sealed bearing starting to go?? Presently it spins perfectly...just makes noise...(but NOT a screeching dry bearing noise)...but the noise being a symptom worries me.

Any mags have similar issues with their Mavic hubs?


I

[icelanticskier]

pull freehub and lube ratchet thingys and stuff. put back together. super simple. rode 4 seasons on my crossmax 29 wheels without ever having to touch em till the hub started to act up. worked like a charm and about a 5 minute fix.

rog

[jono]

If you are opening up the freehub have a look at the condition of the bushing (?) and the surface it rides against in the inboard end. If it is like the Crossmax there is a plastic bushing that can wear the anodized aluminum it spins on and as soon as that starts it wears fast... something about aluminum oxide in the face of the bushing makes it a lot like sandpaper.

Rog, what lube did you use? Zipp used a similar design and I see where they're particular about the lube because of it.

[kidwoo]

Yeah just take them apart, clean and lube them.

Not a big deal.

How old are those wheels. I don't know about the road ones but they quit using those bushings in them a few years ago. You may just have a beat bearing.

[rainier]

Pretty sure the FH body on these wheels predates the design you all are talking about. I think it's a stand alone unit with a couple sets of bearings. The newer one you all refer to is super easy to service, but the one on AKR's wheels might a bit more of a PITA.

Either way check the freehub out, most likely the culprit

[icelanticskier]

Rog, what lube did you use? Zipp used a similar design and I see where they're particular about the lube because of it.

mineral oil if I remember correctly. if not that prolly finish line dry. I use that shit on everything. bike noise? creaky spokes? gonna turn some nips? finish line dry baby. makes noises go away. great chain lube too

rog

[mntlion]

maybe one of the pawls too? hub bearings, or freehub is my guess too