Mavic Cosmos wheel.



I noticed the wheel had a loose spoke and was out of true. Upon inspection it looks like the eyelet itself is pulling out of the rim. I don't know how those eyelets work but I'm assuming they are pressed, almost riveted, into place or something?

I was able to tighten the spoke and re-true the wheel but I haven't ridden it yet. Is this rim shot? Or is the eyelet simply split or something and maybe the part inside the rim is still fine?

Thanks for any info.

I think cosmos uses a double eyelet so check the back side.

Plus one, though the only other time I saw this was when a friend attempted to true his wheels and over tightened a spoke and both eyelets pulled. That resulted in the outside eyelet looking like yours and the inside eyelet breaking into pieces which were loose inside the rim.

If the inside eyelet is fine then ride and not worry since most frames today are only single eyelets anyways.

Most of the time this scraps the wheel because the eyelets are riveted into the rim; but you could try loosening the effected spoke and remove the nipple and replacing the inside eyelet with a washer if it's broken. You could try this too if the washer idea fails: https://www.createforless.com/product...aspx?pid=72120

If you do manage to fix the rim, keep an eye on it for as long as you own the wheels, because usually if one eyelet fails others are soon to follow.

By the way my friend had Cosmos too!! I've had heard on other forums that some Mavic and Sun rims had this problem, I'm sure others have too. I've heard that some people have tried touring or clydesdale type of riders riding on single eyelet rims and having this problem.

OK, so I checked and the rim has double eyelets. I looked it up and if I understand correctly; double eyelets means that there is an eyelet insert riveted to both walls of a double walled rim. So I'm assuming that I pulled the insert through one of the walls and now I essentially have a single eyelet on the inside wall of the rim. Does that sound about right?

I'll go ahead and ride with it and see if it holds up, but I don't have much hope for it.

That's about where you should be. I had this happen on a Sun Rim with eyelets. It rode for a few months after the process started, but in the end the rim needed to be replaced. The tension on the spoke and nipples pulled the eyelet apart. My rim did not fail catastrophically, and I suspect that yours will not, either.

It's the beginning of the end. It's barely possible that the inner eyelet wasn't fully seated when the rim was made, and now having settled the lower one was able to pull through a bit. That would be OK, and was fairly common when double eyelet rims were first built years ago.

Bit I suspect that you're seeing the eyelet and nipple extrude through the spoke hole, which is an unstoppable process. True it up as best as possible, avoiding excess spoke tension (which may have been a causative factor) and continue to ride it. It'll let go eventually, but that could be weeks or months out. However don't plan any extended trips on this wheel so you can't be stranded 4 days out.

Did you read my post? You need to dismount the tire and tube and remove the rim tape and look at the inside eyelet BEFORE you ride off on a glorious ride that could turn ugly, if the spoke breaks it could taco the rim causing you to crash...nice way to test ride to see if it holds up. And I even offered suggestions on how to fix it if the inside rivet is shot. If the rivet inside is fine then it's good to ride, if not then one of the fixes I mentioned could make the rim good to ride.

This greatly exaggerates the hazard of riding it.

Yes, it's possible, but in the real world spokes break all the time and wheels don't taco because of it. When spokes break and wheels taco, it's usually a simultaneous and not cause and effect, but both happening from the same cause.

Odds are the rim will stay true enough for you to ride home on it, with the brake QR opened so it doesn't rub. You might also consider carrying a spoke wrench so you could bring the rim a bit truer in the field. The only safety step I suggest is that if you're riding any distance with the loose spoke, twist it around it's neighbor so it can't get tangled in anything.

Kinda sorta had the same thing happen to me 5 or 6 years ago. Had a spoke eyelet break half apart on the rim, leaving the other half still on. The spoke was still good so I trued it and went on riding for a month. That same spoke became loose again over time as the bad eyelet slowly disintegrated, transferring its load burden to the surrounding spokes. Eventually the rim started pulling apart around the other spokes, not right at the other eyelets but about 4-5 mm from them. The rim was toast, and it was a Mavic Open 4 CD rim. Had to shut the bike down and build up a new set of wheels.

Sorry but your rim is dying.

Yes, I read your post.

Once the tire/tube/tape is removed, I couldn't really see much. There's a large outer hole, and what looks like a small nylock nut down in there. I couldn't see anything that looked much different from any of the other spoke heads. I had to clamp onto the spoke with pliers to turn the nipple and once the spoke tightened up and trued I didn't inspect further. It's an odd wheel.

If the nipple nut looks just like the others then the second eyelet is holding so it's good to ride. But you will have to pay attention to it that rim before every ride to make sure that particular area is not getting worse or the rim isn't cracking around the eyelet.

Had this happen and adjacent eyelets started doing the same. You're pretty much SOL. The good news is you have a great reason to upgrade your wheelset. I went with Neuvations, a very reasonable way to go.

There's also a great wheel you can get from a company called Kinlin, you can get a full set of wheels for about $475, see: https://www.ebay.com/itm/SHIMANO-AERO...#ht_1830wt_882 Also do a web search on these wheels, they have gotten rave reviews.

Perhaps it is holding full tension inside the rim. I doubt it will last too long, but breaking a spoke is not too serious. A 32 spoke rim can lose multiple (sometimes 4 or 5 or more) and still be rideable for the short term. I once broke a spoke at the start of a 90 km ride and just kept riding By the end of the day 3 more had broken, and the wheel was pretty out of whack, but I was still riding. A lower count spoke would presumably become unridable sooner.
The wheel is toast, though. Common sense would suggest the rim has failed and the repair has got it probably good enough to ride, but very likely much weaker than it was before the failure.
I would plan for the inevitable complete failure of the rim (nipple pulls right through, same seriousness as a broken spoke) and be ready to replace it when it happens.

How old is the wheel and how many miles?