Mavic Cosmic Pro Carbon SL UST review

[@Norman92151]

I purchased a set of MAVIC Ksyrium UST's last year after doing my own research and watching GCN. I had been very frustrated with the Schwalbe Pro 1s tubeless tires. The Schwalbes were next to IMPOSSIBLE to mount onto my HED Ardennes II's which were "tubeless ready" provided you installed rim tape. The Schwalbe beads are massive and difficult to seat let alone get onto the wheel. Once on, you can get "wheel hop" due to unseated beads. Have to tell you I couldn't be happier with MAVIC UST. I have not experienced any trouble whatsoever in mounting or removing the Yksion tires. I have to point out however that the tires are not long lived but they are grippy (as one might expect is the tradeoff). Anyone thinking of taking the plunge to tubeless my advice is don't use wheels which require rim tape to seal the spoke holes. I've found this system to be a ticking time bomb failure point. Eventually the sealant will get underneath the tape and cause the adhesive to fail and thus leak sealant/air so bad that it will not self-seal. Go UST. That's my 2 cents.

[@DuallyDieselFord]

Lol. I had the exact same issue with my dt swiss tubeless. Hit a pothole and ripped the sidewall. It was nearly impossible to get the old tire off without levers, and when everything is covered in sealant. I'm on the fence since they never once flatted in the 5000 miles I put on up to that point

[@RoadBikeCulture]

The Great Falloni hi, thanks for watching my video and leaving a comment. Tubed tires definitely leave me with a sense of security, I know I can always fix them, but tubeless is a better technology with a better ride feel, and now I have zero sense of security on a long solo ride.

[@davidide1525]

One advantage to tubeless that is not often mentioned is, not unlike a tubular tire, air can only escape through the puncture , so it probably will stay on the rim long enough to stop. I went tubeless I 2011 after a 50 mph rear blow out on a steep descent. Tire came off the rim immediately and wrapped around the brake , I catapult over the bars and the aftermath was quite grim. I ride tubeless and will put up with some minor hassles for the gains. Oh, try carrying a smaller tube than you would for the same size in a clincher. It makes it easier to get in and going and you only need it to get home. I subscribe and really like your reviews and ideas .

[@bauzy002]

"...and you only need it to get home". How do you repair a punctured tubeless tyre that has not sealed so you can go tubeless again? Thanks.

[@lreginato4975]

My Mavic Yksion USTs developed bubbles on the sidewall of the tubeless tyre within 600km and Mavic are finding all sorts of excuses for NOT replacing the tyre. I'm wondering if they are now getting too many of these defects to replace them all. I wonder if they should be recalling these tyres until they fix the problem. I wouldn't recommend Yksion UST Tubeless to anyone.

[@mokasusa]

And what with maintenance? What is the frequency of service?

[@BruceChastain]

I know everyone raves about tubeless but it also seems like people are always having problems with them. For now I'm going to stick with regular old go to hell tube tires. Excellent looking wheels though.

[@BruceChastain]

but also I'm too cheap to buy tubeless wheels right now.

[@RoadBikeCulture]

Bruce Chastain - cycling stuff Hi Bruce, thanks for watching my video and taking the time to leave a comment. Despite all the benefits of tubeless, knowing what I know now, I'm not sure if I’d buy tubeless again, but the ride quality is absolutely amazing.

[@solitaryrefinement6787]

Agreed. It's one of those technologies that when they work, they work awesome, but when they don't, it's catastrophic. Even with a gashed tire, you can repair it with a tire boot (or even duct tape or whatever you find on the side of the road), put a new tube in it and you're back on the road. I think they're best left to racing or to near perfect road riding. When I built my first custom bike, I went over board with the fancy schmancy stuff. I just built my 2nd and have a much stronger and more reliable bike that isn't as finicky about tuning. I want to spend more time on the road than in a shop.

[@crypto_que]

I'm using conti race tubes with conti Ultra Sport II 28 front, 32 Gatorskin rear, with Mavic Cosmic Carbon AND I LOVE THEM!!!

[@RoadBikeCulture]

Crypto Que that sounds like a great plan!

[@kay19833]

carbon braking surface of alluminium? what's the general feel and performance gain over your standard alluminium wheelset?

[@palicar]

I run tubeless as well. It’s nice but some tires seem impossible to mount. I always carry a tube in case. Don’t want to tempt fate.

[@RoadBikeCulture]

Patrick Carroll, I agree with you, but even with a tube and levers it’s a real problem putting a tube in.

[@kingztan]

Is the carbon wall soft? I could pinch it

[@rychartz]

Yes, it is

[@ayowser01]

Do you know what's the difference between the SL and standard model UST? Is it just the hubs?

[@mizzorian]

SL is super light and UST is their tubeless system

[@ayowser01]

@@mizzorian I figured it out. I ended up buying the standard model. You're right: the sl has lighter spoke nipples, hub and qr. Also the hub uses their id360 ratchet system, which is theoretically superior.

[@tdr5944]

What’s different between cosmic pro and the ksyrium pro?

[@mizzorian]

Mavic website says Cosmic is for speed, racyness and lightness, while the Ksyrium is for endurance (even though some Kyrium variations are as light as Cosmic)

[@jspaceman71]

Can you use non-Mavic tubeless tires with these? (I take it you can't, but I just want to be sure). What about clinchers with tubes? Can you run them with any brand of tire?

[@guybrushthreepwood3002]

Of course you can, I just got these wheels, which came with no tyres, fitted with 28c Schwable Pro ones.

[@babybelkin977]

Go tubulars, love them , put some sealant in them and your good to go, carry a spare if your worried but tubeless is a personal thing for me no thanks

[@RoadBikeCulture]

Baby Belkin I have too many memories of tubular tires coming unglued in races back in the day,

[@blufish11]

Looking at Cosmic Pro Carbon UST Disc. tires getting a bad rap and cassette wobbling some people mention. Have you put different tires other than mavic on yours? Can you go wider or is it ok to go to 28mm instead of 25mm they provide with purchase? Price is right on these- just a bit nervous on ditching the mavic tires after they wear out. Appreciate any thoughts.

[@bodoprobst]

What tyre width were you using when you had the mounting issue ? The rim width is 19mm internal, so 28mm tyres should be the choice as they roll faster than 25's, have more grip and corner better

[@derekh7892]

NO point and thats not even the subject

[@Maverick5588]

How are the wheels still going?

[@valiantabello]

The only thing I hate more than Trump is Mavic tires. The quality control issues you mentioned are no surprise to me, and neither is the # of flats you got. I think Mavic's UST design will only be worth pursuing when other tire manufacturers take it up, but I don't think any have(?) Anyway, love your reviews!

[@RoadBikeCulture]

Valiant Abello best comment EVER!!!

[@codexTu]

This mavic tires are very bad. Use a good set of continental gp5000 and see the major difference. I have the same wheels and is like night and day

[@user-vn9js9yn1j]

@@codexTu did it have no problem with gp5000 & tubes?

[@allisterbrimble1]

Just had to replace my tyres. Exactly the same experience too. Firstly, they were utterly welded on! The glue obviously turns into some sort of superglue after about a year. It took my at least an hour to take them off, having to cut through some weird cotton fibres that had appeared and breaking my two carbon tyre levers. Finally used a screwdriver and even then struggled and got some scratches on the rims. All the advertising saying they are easy to take off is bullshit. I like the actual wheel though.

[@0321recon]

I have these and they are in the shop. One tire with blisters, and both wheels have issues. One, the rear is now chunky and not spinning freely. Two, the front hub is loose with play. Caution on getting these. Also, if you do have to get the tubeless tire off, forget it, it will nearly break you.

[@codexTu]

Normal version or SL? hubs are different

[@k.a.w1774]

I know this is a little bit off subject of your video but could you please give us a epic road trip bike ride like maybe Yosemite

[@RoadBikeCulture]

Hi, Kerwin, I did make a couple of videos about a road trip we took to the eastern Sierras. We drove from SF to Lone Pine Ca, to ride Onion Valley, Mt. Whitney, and Horseshoe Meadows. Here are the links to those videos. Have a great day. kzbin.info/www/bejne/jaScnWyffc2Sb68 kzbin.info/www/bejne/j6DJdZmhbt57bKs&index=17 kzbin.info/www/bejne/Y6WpeGaqedCkaJI&index=16

[@bremnet1812]

I'm sorry if I missed it, but did you end up damaging the rim or no?

[@heyo131]

i love the fact that you tell the truth.. but also admit that because this happend to you dosnt mean its instantly a shit wheel! you had a rough time with all this.. but im absolutely sure you also had a lot of good hours on that bike :) thanks again for a high quality video! stay strong!

[@RoadBikeCulture]

Thank you Peter, this is exactly what I am trying to do, shed some light on the things I buy to help others in the decision making.

[@mantelles]

Hi Thanks for posting this well considered review. I was planning to make the same purchase, particularly after I too watched the video that demonstrated how easy it is to fit the Mavic tubeless tires on to the Mavis UST rim. Ummmm, your video demonstrates a very different outcome. What a drag, and what a disappointment on your planned ride getting cut short. Watching everyone struggling to fit the tire was almost painful to watch, and an entire hour, maybe Mavic is not ready from prime time. You did not mention if when removing the tire caused the sealant to flow out and make a mess, was that the case in this instance? Anyway, thanks for posting all the great content.

[@RoadBikeCulture]

e 511 keV Hi, thanks for leaving a comment. Yes, the sealant was everywhere, from the puncture through us changing the tube, it made for a slippery experience. I do love this wheelset and after 3000 miles this was my only problem. I did have a sidewall blow out with tubed wheels as well and I needed to take a cab home, so in the end I do think its a good investment. I'm going to shoot a video with a local bike shop about what to do when this happens, should be up before Christmas, in case this wheelset is on your Santa list! Best Kevin

[@ThePhilematologist]

@@RoadBikeCulture The Gnc video displayed the Cosmic carbons not the ksyriums!

[@robertherrera5891]

Had the same issue. Worst tire set I have encountered. Switched to Continental GP5000 with tubes. Avoid the headache and a ruined ride. Great wheel set but Yksion tires are garbage.

[@bremnet1812]

Good choice in new tires.

[@user-vn9js9yn1j]

Did it have no issue with gp5000 with tubes?

[@robertherrera5891]

@@user-vn9js9yn1j no issues after but they are hard to remove tire. Just make sure tire is perfectly at the center of the wheel.

[@eugenesaburi1757]

I've been running Mavic Comete UST for over a year now and have had zero issues. Last summer, I did a 210 mile ride from Seattle to Portland and had two punctures which self-healed. Given the ride was over 10 hours long and I was on a tight schedule to complete it and am glad I didn't have to deal with punctures. The Mavic UST tires are actually made by Hutchinson, using the high-end "11 Storm" compound - so, they are being made by a tire company in France (vs. cheaper compounds in China/Taiwan). For me, the upside of the UST system outweighs the downside.

[@mrtnlstr]

Great video/review! Can you use other tubeless tires with UST rims, e.g. Schwalbe Pro One? Also, do you wear contact lenses or RX sunglasses for the rides? Thx

[@Carmelov2012]

You have great friends. . and believe me that helps alot

[@rainbowtrout75]

you actually didn't give a review of the wheelset just whinged about how hard it was to change a tyre....thanks for very little content

[@aspartakus]

Thank you very much for this videos. I want mavic cosmic carbon sl too but it seems yksion tires of mavic are bullshit poor quality and very difficult to mount / unmont... With your advices I will tell to my sell to wear continental GP 5000 with tube but please no tubeless technology... This is the exact situation I won't : cannot repair my tire on the road. Best regards. Sorry for my English I'm from France. You can say Mayyyviikk, it's cool too !

[@rockmountbmxer]

Sounds like a few lessons on bunny hops would help.

[@Acura1NSX]

Who the hell has so many flats in their lifetime, I ride 400/miles a week and I've not had this many flats in 15 years! My advice is to move out that Godforsaken state ASAP!