Page 1 of 2 1 2 LastLast
Results 1 to 25 of 32
  1. #1
    mtbr member
    Reputation:
    Join Date
    Aug 2007
    Posts
    43

    No good Kenda tubeless tire: Cant use with sealant (stan's) / voids warranty

    So who wants to run a Tubeless tire without any Stan's style Sealant for security? Right... No one. One thorn could make you carry your bike down miles

    Turns out Kenda tires do not support/warranty their tires with the use of Stans or any other sealant. I outfitted my two bikes any my girlfriends bike with over $300 in Nevegal Dual Compound UST tires. I used Stan's in all 3 for obvious reasons. Within 3 months all 3 bikes had tire failure. Two of them had big bubbles form in the sidewall and looked like they were going to pop after I pumped them up. One of them had the bead separate from the rubber and another had a huge hole punctured in it deep into a ride (I think this is like the bubble problem, except while out riding a semi-sharp rock/root punched a big nickel size hole that i could stick my finger through)... all within 3 months!

    Knowing something was wrong I called Kenda after the 3rd blowout. After politely explaining the problem to Kenda basically told me that any Sealant use voids the warranty, and that is probably what caused the problema. I was basically out of luck. I checked the packaging that they came with, No mention of not using sealant. I checked the website, couldn't find any mention either. I asked my two big local shops here in LA, they didnt know this either.

    CONCLUSION: Dont use Kenda UST Tubeless tires because I wouldnt dare trust a ride to them without sealant. They take thorns VERY easily and I would only run them if you are going to use tubes.

    Just switched to Schwalabe Hans Dampf tires on one of my bikes (after calling them and asking if I can use Stans) and they are Amazing and have held 98% of the air I originally pumped into them a month ago.

  2. #2
    mtbr member
    Reputation:
    Join Date
    Aug 2007
    Posts
    43
    PS... Im sure this post has been made before, but I couldn't find it easily so I decided to post this in the hopes of Informing other, and saving someone else the headache/hassle! Happy Trails to all!!!

  3. #3
    mtbr member
    Reputation:
    Join Date
    Sep 2011
    Posts
    95
    You're not alone. I've seen pics and threads on BikeMojo of the effects of Stan's on Nevegals. The pic showed a Nevegal with a huge (golf ball size) bubble in the tread of the tire. I'm not sure it would even clear the fork if you tried to roll it.

  4. #4
    mtbr member
    Reputation:
    Join Date
    Oct 2004
    Posts
    436
    I use UST SB8s with Stans and no problems. My buddy uses Crossmark UST with Stans and he had the bubbles form (but after many, miles and nearly two years).

  5. #5
    mtbr member
    Reputation: Bailey44's Avatar
    Join Date
    Dec 2010
    Posts
    721
    Their new tires are now marked as "SCT" and state that they are compatible with tubeless fluid conversions.

  6. #6
    Nouveau Retrogrouch SuperModerator
    Reputation: shiggy's Avatar
    Join Date
    Dec 1998
    Posts
    48,024
    Quote Originally Posted by superpd150 View Post
    So who wants to run a Tubeless tire without any Stan's style Sealant for security? Right... No one. One thorn could make you carry your bike down miles

    Turns out Kenda tires do not support/warranty their tires with the use of Stans or any other sealant. I outfitted my two bikes any my girlfriends bike with over $300 in Nevegal Dual Compound UST tires. I used Stan's in all 3 for obvious reasons. Within 3 months all 3 bikes had tire failure. Two of them had big bubbles form in the sidewall and looked like they were going to pop after I pumped them up. One of them had the bead separate from the rubber and another had a huge hole punctured in it deep into a ride (I think this is like the bubble problem, except while out riding a semi-sharp rock/root punched a big nickel size hole that i could stick my finger through)... all within 3 months!

    Knowing something was wrong I called Kenda after the 3rd blowout. After politely explaining the problem to Kenda basically told me that any Sealant use voids the warranty, and that is probably what caused the problema. I was basically out of luck. I checked the packaging that they came with, No mention of not using sealant. I checked the website, couldn't find any mention either. I asked my two big local shops here in LA, they didnt know this either.

    CONCLUSION: Dont use Kenda UST Tubeless tires because I wouldnt dare trust a ride to them without sealant. They take thorns VERY easily and I would only run them if you are going to use tubes.

    Just switched to Schwalabe Hans Dampf tires on one of my bikes (after calling them and asking if I can use Stans) and they are Amazing and have held 98% of the air I originally pumped into them a month ago.
    Yup, that has been the policy for 5-6+ years.

    I do not use sealant in UST tires. No sealant in tubeless ready tires, either, unless absolutely necessary.

    No need to walk out if I get a puncture. I put in an inner tube. Still need to carry tubes with sealant. Can not seal all flats, cuts, punctures, broken valves...
    Last edited by shiggy; 03-06-2012 at 07:40 AM.
    mtbtires.com
    The trouble with common sense is it is no longer common

  7. #7
    mtbr member
    Reputation:
    Join Date
    Jan 2005
    Posts
    148
    Quote Originally Posted by Adroit Rider View Post
    I use UST SB8s with Stans and no problems. My buddy uses Crossmark UST with Stans and he had the bubbles form (but after many, miles and nearly two years).
    I use Stans too and I got bubbles on my Crossmark UST 26x2.1 after 5 months and ~1500km. the biggest bubble was a size of a central knob (and the knobs are pretty worn, the cross mark is just barely visible). Punctured the bubble with a needle, clear fluid squirted from the bubble, no air escaping at all.

  8. #8
    mtbr member
    Reputation: Poopshute's Avatar
    Join Date
    Mar 2010
    Posts
    247
    I've heard the horror stories of bubbling Kendas. I took a gamble and installed two Nevegal DTC/UST tires with Stans. They've been going strong for almost a year now. I just recently (last night) replaced the rear Nev with a Slant Six. Hoping this one holds up just as well. Having sealant in there gives a bit more peace of mind then having nothing at all. Didn't take much to get a hole in my Nevegal from a thorn. I'm actually quite surprised to hear that the OP had tire failure after 3 months.

  9. #9
    mtbr member
    Reputation:
    Join Date
    Jul 2010
    Posts
    115
    [QUOTE=Poopshute;9150895]I've heard the horror stories of bubbling Kendas. I took a gamble and installed two Nevegal DTC/UST tires with Stans. They've been going strong for almost a year now. QUOTE]

    Thats been my experience as well..have had nevegals with stans for ~3-4 months with out issue.

  10. #10
    mtbr member
    Reputation: Poopshute's Avatar
    Join Date
    Mar 2010
    Posts
    247
    I feel like an idiot. I fully intented on using Stans with the new Slant Six I bought. Didn't realize Kenda has an STC (sealant version) for the Slant Six. Bought a UTC and already juiced it and installed it. Lol. Hope it holds up as good as the Nevegal UTC! I really hope the whole SCT thing is just marketing.

  11. #11
    mtbr member
    Reputation:
    Join Date
    May 2009
    Posts
    181
    Quote Originally Posted by Poopshute View Post
    I feel like an idiot. I fully intented on using Stans with the new Slant Six I bought. Didn't realize Kenda has an STC (sealant version) for the Slant Six. Bought a UTC and already juiced it and installed it. Lol. Hope it holds up as good as the Nevegal UTC! I really hope the whole SCT thing is just marketing.
    Its not just marketing, but not all non SCT versions have issues with Stan's. It is a roll of the dice though, and proof that you need to read labels.

  12. #12
    mtbr member
    Reputation:
    Join Date
    Jun 2006
    Posts
    395
    FWIW I have been using Kenda UST with Stans on 2 bikes since 2005 or so. Nev's, SB'8 and now Slant 6 and never had a problem or a flat. According to my odometers about 11K miles on the bikes. I guess I am lucky.

  13. #13
    mtbr member
    Reputation: Poopshute's Avatar
    Join Date
    Mar 2010
    Posts
    247
    Quote Originally Posted by mobaar View Post
    Its not just marketing, but not all non SCT versions have issues with Stan's. It is a roll of the dice though, and proof that you need to read labels.
    Yeah, that's kinda true. I still would've juiced the slant 6 if they didn't have the SCT version.

    Quote Originally Posted by 13pumps View Post
    FWIW I have been using Kenda UST with Stans on 2 bikes since 2005 or so. Nev's, SB'8 and now Slant 6 and never had a problem or a flat. According to my odometers about 11K miles on the bikes. I guess I am lucky.
    Are you using an SCT version of the slant 6 or the UST?

  14. #14
    mtbr member
    Reputation: kevocastro's Avatar
    Join Date
    Sep 2011
    Posts
    356
    I'm about going tubeless on my SB8 29" and since they're not tubeless ready tires I guess they will be fine on Stans juice right? Would hate to get bubbles from, should I go for it?

  15. #15
    mtbr member
    Reputation: Poopshute's Avatar
    Join Date
    Mar 2010
    Posts
    247
    Quote Originally Posted by kevocastro View Post
    I'm about going tubeless on my SB8 29" and since they're not tubeless ready tires I guess they will be fine on Stans juice right? Would hate to get bubbles from, should I go for it?
    Not necessarily. The only tires Kenda says are ok to use with juice are their SCT tubeless ready tires. Their UST and non-tubeless ready tires are not gauranteed to work with juice. I have been running Kenda UST tires with juice in them for over a year now and haven't had any problems. Seems like its hit or miss with non-SCT tires although it also seems the bubbling issues are more rare these days.

  16. #16
    I should be studying...
    Reputation: frank daleview's Avatar
    Join Date
    Jan 2004
    Posts
    827
    Similar here, I've been running non UST Kenda nevegals, Dred tred, and small blocks with stans for years and never a problem.
    Formerly known as iceaxe

  17. #17
    ride
    Reputation: ignazjr's Avatar
    Join Date
    Dec 2003
    Posts
    4,823
    UST was designed to be a tubeless system with which no sealant is necessary. I've run UST tires both with and without sealant. The bead on UST will lock in place and create it's own seal, so the sealant in the tire is stricly for punctures. In addition to that, UST tires have heavier denser rubber and sidewalls and are significantly less prone to thorns and cactus than regular tires.

    Generally, when the bubbles form on tires, you're ok to pop em carefully and keep riding. Never had an issue with that. If you are set on running a sealant in a UST tire for thorns and such, consider using regular ol' Slime instead. It's cheaper and not toxic to tires to my knowledge. Slime won't seal a bead on a ghetto tubeless setup, but it'll work well to plug holes in a UST tire.
    Redstone Cyclery
    turner*intense*transition*REEB*Rocky Mt
    web - tweet - FB
    Lyons, CO

  18. #18
    mtbr member
    Reputation: Poopshute's Avatar
    Join Date
    Mar 2010
    Posts
    247
    Quote Originally Posted by ignazjr View Post
    UST was designed to be a tubeless system with which no sealant is necessary. I've run UST tires both with and without sealant. The bead on UST will lock in place and create it's own seal, so the sealant in the tire is stricly for punctures. In addition to that, UST tires have heavier denser rubber and sidewalls and are significantly less prone to thorns and cactus than regular tires.

    Generally, when the bubbles form on tires, you're ok to pop em carefully and keep riding. Never had an issue with that. If you are set on running a sealant in a UST tire for thorns and such, consider using regular ol' Slime instead. It's cheaper and not toxic to tires to my knowledge. Slime won't seal a bead on a ghetto tubeless setup, but it'll work well to plug holes in a UST tire.
    I was wondering if I should've ran sealant since UST tires are supposed to be more "thorn resistant". Isn't the case. You get one of those goat-heads in your tire and you don't catch and ride a few miles with it, those thorns will puncture right through. The sealant definitely helped. Rather have sealant in there rather than nothing at all. Haven't really messed with slime but Stans seems to do the trick.

  19. #19
    ride
    Reputation: ignazjr's Avatar
    Join Date
    Dec 2003
    Posts
    4,823
    I've had good luck with cactus and thorns in my UST tires when not running sealant, but that was quite a while ago. Personally, I run Stan's in my UST tires (Maxxis and/or Conti) and I have never seen the bubble issue on my own tires. We see it a lot in the shop, though, but it's primarily on older tires. Just thought I'd throw the Slime idea out there for folks that have had problems with bubbles and thornage. Slime works pretty good, know a lot of folks doing that.
    Redstone Cyclery
    turner*intense*transition*REEB*Rocky Mt
    web - tweet - FB
    Lyons, CO

  20. #20
    mtbr member
    Reputation:
    Join Date
    Jul 2010
    Posts
    115
    Quote Originally Posted by Poopshute View Post
    I've heard the horror stories of bubbling Kendas. I took a gamble and installed two Nevegal DTC/UST tires with Stans. They've been going strong for almost a year now.
    Quote Originally Posted by borracho View Post
    Thats been my experience as well..have had nevegals with stans for ~3-4 months with out issue.
    Add me to the list now
    Went out to get an early lunch ride in...had my back pack on, helmet straped, tunes playing...getting ready to swing my leg over the saddle when I notice a series of bubbles on my rear tire and a chunk of tread missing. wtf.

    Guess on the good side of things I have a new excuse to go shopping for tires

  21. #21
    mtbr member
    Reputation:
    Join Date
    Jan 2008
    Posts
    55

    Blew out my Nevegal

    Bubble in my Nevegal, Blew and luckily a FS truck came by and gave me a ride the several miles back.
    The suggestion a few posts back...don't run sealant and put in a tube when it gets a hole in it. That's obvious but then what? Buy a new tire? In the desert you get multiple holes almost every ride simply from debris in the trail. You can see Stans coming out of pin hole punctures after a ride that would otherwise leave you with a flat if you had no sealant. Obviously you bring tubes but that should only be as a backup after a total failure of your tire, loss of the bead seal, etc. Without a sealant a tubeless tire would probably go flat quite often. Would you try to warranty the tire for each puncture that occurred?

  22. #22
    mtbr member
    Reputation: Poopshute's Avatar
    Join Date
    Mar 2010
    Posts
    247
    Quote Originally Posted by dbbarney View Post
    Bubble in my Nevegal, Blew and luckily a FS truck came by and gave me a ride the several miles back.
    The suggestion a few posts back...don't run sealant and put in a tube when it gets a hole in it. That's obvious but then what? Buy a new tire? In the desert you get multiple holes almost every ride simply from debris in the trail. You can see Stans coming out of pin hole punctures after a ride that would otherwise leave you with a flat if you had no sealant. Obviously you bring tubes but that should only be as a backup after a total failure of your tire, loss of the bead seal, etc. Without a sealant a tubeless tire would probably go flat quite often. Would you try to warranty the tire for each puncture that occurred?

    I think it would be helpful if people here would post what version of the nevegal's they are having issues with. I'm assuming most of these bubbles/blow-outs are with the standard NON-UST style tire. If so, it's not that surprising that bubbles form. I still haven't had a single issue with Stan's and my UST nevegal/slant six setup.

  23. #23
    mtbr member
    Reputation: One Pivot's Avatar
    Join Date
    Nov 2009
    Posts
    4,123
    Unless you ride nothing but downhill smooth edged slick rock and roots, its time to move away from nevegals! They have a plethora of problems, tubed or tubeless.

    Its just time to move on, theres drastically better tires out there now.

  24. #24
    mtbr member
    Reputation:
    Join Date
    Jan 2009
    Posts
    39
    Quote Originally Posted by One Pivot View Post
    Unless you ride nothing but downhill smooth edged slick rock and roots, its time to move away from nevegals! They have a plethora of problems, tubed or tubeless.

    Its just time to move on, theres drastically better tires out there now.
    What's odd is that I'm moving back to them after being away for a while. There's other tires, different tires, but better is highly subjective to a wide range of variables. I ride a range of highly technical rocky terrain to fairly average medium-tech singletrack with roots and such.

    I love the ride of my Specialized Cap'n Controls but after a few months, the sidewalls get weak and flexy to the point I have to worry about burping them over every log hop with a turn... and I have to keep adding more psi with each ride. So, is that better than the Nevegal? No, just different.

    Every tire has a compromise. Nevegals are the best all-around mtb tire I've used in many years of riding. They just feel right. It's too bad about not using Stan's, though. I always use it and haven't had bubble or any of the issues I've read about. I guess I'm lucky... and I will test my luck again. I think the tire seats better when you use Stan's and it leaks less overall. Each ride pulls the tire a little bit and I just can't count on the bead to stay seated. I burp tires for some reason... if it weren't for Stan's, I think I'd burp even more.

    -C

  25. #25
    no trees are safe
    Reputation: Millfox's Avatar
    Join Date
    Jun 2012
    Posts
    492
    Quote Originally Posted by dbbarney View Post
    Bubble in my Nevegal, Blew and luckily a FS truck came by and gave me a ride the several miles back.
    The suggestion a few posts back...don't run sealant and put in a tube when it gets a hole in it. That's obvious but then what? Buy a new tire? In the desert you get multiple holes almost every ride simply from debris in the trail. You can see Stans coming out of pin hole punctures after a ride that would otherwise leave you with a flat if you had no sealant. Obviously you bring tubes but that should only be as a backup after a total failure of your tire, loss of the bead seal, etc. Without a sealant a tubeless tire would probably go flat quite often. Would you try to warranty the tire for each puncture that occurred?
    You can patch a tubeless tyre just as you path a tube.

Page 1 of 2 1 2 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •