Balancing a wheel with Tubliss

Discussion in 'The Garage' started by oxygenrace, Apr 23, 2014.

  1. Neil E.

    Neil E. Been here awhile

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    I've had a Tubliss front tube fail. The tube is stressed at the valve stem due to the nut required on the stem. They provide a rubber washer that protects the tube from the nut, but the nut and washer hold the tube elevated from the rim. The tube has to stretch down to contact the rim and this creates a stress point. The failure spot is about 1/4" long, right near the base of the valve stem. After having the front fail, I checked my rear Tubliss and the tube had the same failure developing (it just hadn't burst yet). These tubes were in service for more than a year.

    The tube would have a better fit if the valve stem nut was removed; however the tube has no reinforcement at the stem base. The brass stem is the same diameter over it's full length and only has some grooves to grip the rubber. If the nut is removed the high pressure will extrude the stem out of the tube. I beveled the valve stem hole inside the rim and gave the nut a matching bevel. This lets the nut sit closer to the rim so there is less stretching of the tube. I installed new Gen2 Tubliss systems front and rear. The Gen 2 inner tube is supposed to be thicker than the original, but I didn't notice any significant change in thickness.
    #21
  2. greasyfatman

    greasyfatman Long timer

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    Where do you get the lead spoke weights these days?
    #22
  3. Yinzer Moto

    Yinzer Moto aka: trailer Rails

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    I have a whole pile of inner bladders that have failed in a similar manner, I don’t think it is from stretching as much as a manufacturing error. It appears that the rubber is delaminating.
    #23
  4. Neil E.

    Neil E. Been here awhile

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    I got the distinct impression that the rubber washer deformed enough to let the tube rub against the edge of the nut. The bad spot on tube matched the length of a nut flat. Since the flats lined up with the bad spot I figured the nut had stressed the tube. Both of my tubes had exactly the same failure location near the base of the high pressure valve stem. Everywhere else on the tube looked good. In my case it appeared that the nut had worn into the tube. I don't remember seeing any kind of layering to the bad spots. I'll inspect the tube carefully if it happens again.
    #24
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  5. kwb377

    kwb377 Non-Professional Rider On A Not-So-Closed Course

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    I'm trying to visualize, but probably missing something obvious...how do you air up the low pressure bladder if you remove the Tubliss rim lock?

    [​IMG]
    #25
  6. Fred-O

    Fred-O Been here awhile

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    #26
  7. FlyingFish

    FlyingFish The older I get, the faster I was

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    Nomar spoke weights work perfect. Just make sure to loctite the little setscrew.
    IMG_6441.JPG
    #27
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  8. Neil E.

    Neil E. Been here awhile

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    weight2.jpg weight1.jpg

    I cast some weights from old solder. Worked out well but making the mold was tedious.
    #28
  9. baloneyskin daddy

    baloneyskin daddy bikaholic

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    Not really a rim lock,its the device they designed to allow you to put air into the actual tire after the bladder is installed.
    #29
  10. kwb377

    kwb377 Non-Professional Rider On A Not-So-Closed Course

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    Tubliss calls it a rim lock in the printed instructions and tutorial vids, and after installation you torque the nut to press the aluminum rim-lock looking piece against the tire bead to lock the tire and rim together.

    But it's not a rim lock? :scratch

    http://tubliss.com/tubliss/installation/




    That's what has me baffled...someone claims to have eliminated it from their Tubliss, but without it there's no way to get air to the low pressure side.
    #30
  11. Yinzer Moto

    Yinzer Moto aka: trailer Rails

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    They probably left the stem. It is multiple pieces that can be taken apart. The rim lock part can be removed.

    It is absolutely a rim lock. The inner bladder does a good job of locking the bead in place but in the even of bladder failure, a backup device needs to be in place.
    #31
  12. arnoldus

    arnoldus Been here awhile

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    Is no one using the Outex tubeless tape anymore?

    [​IMG]
    #32
  13. rucamalenca

    rucamalenca n00b

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    Is that pile of tubliss or conventional bladders?

    I've been using my Tubliss on the rear wheel for 6200 miles, in five years, and it hardly needed to be inflated. It works so well I now realize I've been careless, and will replace the bladder soon.
    I'm surprised about how well some of you deal with the extra weight needed to balance the rims. Having trouble to get spoke leads, I've tried stick ons, which fled due to my rim not being flat enough. I even made a fake rim lock, by inserting a bolt which head I've shaped to fit perfectly in the rim well, and putting nuts on the outside to match the needed weight. Worked great, and it was bulletproof. But handling and braking above 65 mph was horrible. I used the original hole of the rim for this

    Attached Files:

    #33
  14. rucamalenca

    rucamalenca n00b

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    I guess you removed the yellow part of the rim lock, would you please post how much they weigh?
    By the way, is it possible to replace the heavy original steel nut with a lighter one?
    thank you!
    #34
  15. ohgood

    ohgood Just givver tha berries !!!

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    I used it. Very simple, very fast tire changes. Feels better than a tube at 10psi.....


    But over time dirt works it's way between the bead of the tire and the rim, causing a slow leak.

    For street it should be fine, for off road it isn't optimal.
    #35
  16. Force0321

    Force0321 Dirty Pirate

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    How many ounces did you use? I just mounted an MT-43 on the rear of my KTM 690 with the Tubliss system. Haven't balanced it yet. Seems stable up to 65 mph so far running 10 psi.
    #36
  17. FlyingFish

    FlyingFish The older I get, the faster I was

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    I used 4.5 ounces on each wheel, (3=1.50 oz weights).
    That's a lot of unbalance if you don't do it! It will wear tires and suspension faster than anything else even if you perceive that you don't feel it.

    Force0321 are you doing the BOM ride this year?
    #37
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  18. Force0321

    Force0321 Dirty Pirate

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    Thanks for the info.
    Not doing the BOM this year. Did it last year. Some of Timmer's days look to be a bit long.
    Doing a 3 week offroad ride with my crew from last year into Idaho. Fishing and relaxing.
    Last years BOM turned into a Dakar style race to the next camp everyday. It was a blast tho.
    I'll see where we are at in the trip, but hope to make Wansfel's last ride up the Magruder. I think it starts on July 21st.
    #38
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