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Flat Tire Defender

Discussion in 'Downhill & Freeride' started by djjohnr, Feb 10, 2017.

  1. djjohnr

    djjohnr Turbo Monkey

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  2. jonKranked

    jonKranked Press Button, Receive Stupid

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  3. jonKranked

    jonKranked Press Button, Receive Stupid

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    sniped! :shakefist:
     
  4. ianjenn

    ianjenn Turbo Monkey

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    Couldn't we just make the tires 250-350 grams heavier....
     
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  5. 'size

    'size Turbo Monkey

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    and reusable.
     
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  6. jonKranked

    jonKranked Press Button, Receive Stupid

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    been there, done that. we move to the future, not the past.
     
  7. djjohnr

    djjohnr Turbo Monkey

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    I might guinea pig one of these on my Delirium. There's been some times in the gnar when I've wished for more rear travel, this could be an improvement.
     
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  8. Jm_

    Jm_ Turbo Monkey

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    This solves two important issues that have already been solved. 1, no more pinch flats, and 2, no more punctures. Don't worry though, it's not like they are reinventing the wheel...
     
  9. djjohnr

    djjohnr Turbo Monkey

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    If you watch the video of Gwin, he focuses on the square edge bump improvement and comments on flat protection like an afterthought. The latter is clearly not the main benefit to him.
     
  10. rpet

    rpet Turbo Monkey

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    My understanding of Mousses (as they are called in the enduro/dakar moto world) is that the 3 drawbacks are: melting at high speeds (over 100 mph on pavement), VERY hard to install and weight.

    The first issue would not be a problem for us, and the 2nd wouldn't either if they never require trailside maintenance. WEIGHT THOUGH.

    I think most/all ISDE/Dakar/BAJA pro/amateur riders use them over tubes now?
     
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  11. jonKranked

    jonKranked Press Button, Receive Stupid

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    the weight isn't much more than a DH tube. Gwin seems to think they're worth the weight penalty for the performance (and not smashing rims) and the extra security on not flatting (which will end a race run pretty quick)
     
  12. Electric_City

    Electric_City The orangutans are loose!

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    Fify

    Noted. Ummm... Didn't he win when he flatted?
     
    #12 -   Feb 13, 2017
    Last edited: Feb 13, 2017
  13. jonKranked

    jonKranked Press Button, Receive Stupid

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    fair point, but there are other items out there that were once decried as unnecessary extra weight; dropper posts, suspension, disc brakes :clue:


    he's finished race runs after flatting / losing a tire, but didn't win. you're probably thinking of his chainless win.
     
  14. ianjenn

    ianjenn Turbo Monkey

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    Did he have this installed when he flatted that is the question.....
     
  15. trib

    trib not worthy of a Rux.

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    Yes he did.

    There are pictures of his bike after the run with the tire off, and the FTD flapping about.

    Also worth noting that it was a sidewall tear, so neither procore, tubeless or the FTD would really have saved that run.
     
  16. Flo33

    Flo33 Turbo Monkey

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    I think you're talking about last year's WC run. He did not finish that one.
    But he finished his run at Leogang in 2014 and that's the run @ianjenn was referring to.
     
  17. Kanye West

    Kanye West 220# bag of hacktastic

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    To add to drawbacks - cost, prone to rotting if they sit for more than a month, doesn't simulate a very low psi unless you drill holes in it,

    Not all of them use the Mousses (Meese?). UHD tubes are still common, as are the Nuetech Tubliss setup.
     
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  18. Jm_

    Jm_ Turbo Monkey

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    Bam, you don't have avoid flats by cowering under your afghan anymore:



    *mic drop*
     
  19. kickstand

    kickstand Turbo Monkey

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    These make zero sense to me.
     
  20. Flo33

    Flo33 Turbo Monkey

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    Only works with Onza tires.
     
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  21. mrgto

    mrgto Monkey

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    IMG_4598.JPG White skin walls only I heard.

     
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  22. kickstand

    kickstand Turbo Monkey

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    As was point out, heavy duty tubes or the tubeliss (basically moto procore) are both used.

    I'll add two more drawbacks to the mooses....expensive, and they only last 6-12 months before they begin breaking down.
     
  23. dcamp29

    dcamp29 Monkey

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  24. jonKranked

    jonKranked Press Button, Receive Stupid

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    correct. closed cell.

    and that would be HELLA ghetto. given that this is a straight piece, you'd probably encounter some issues trying to counter it into a circular shape.
     
  25. dcamp29

    dcamp29 Monkey

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    I'll take ghetto and functional for $2. Also thinking about some PEX pipe bent into a circle (bead diameter) filled with great stuff or something. Going to lowes tonight.
     
  26. WestCoastHucker

    WestCoastHucker Turbo Monkey

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    daydreaming about a new rhythm line.....
    staple it together...
     
  27. jonKranked

    jonKranked Press Button, Receive Stupid

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    I was thinking more wrinkles/creases.
     
  28. trib

    trib not worthy of a Rux.

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    A cut half way through the foam every inch or so should allow it to flex enough without creasing.
     
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  29. WestCoastHucker

    WestCoastHucker Turbo Monkey

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    daydreaming about a new rhythm line.....
    i wasn't really suggesting one put staples inside their tires...
     
  30. jonKranked

    jonKranked Press Button, Receive Stupid

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    Give it a shot, report back.


    Although I'd venture a guess that pex is too rigid to achieve the desired results.
     
  31. kickstand

    kickstand Turbo Monkey

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    I've got piles of extra Pex laying around. I don't think I would want a rigid plastic pipe (yes I know it's somewhat flexible) in there, I can't see it really doing much good....

    I've also got piles of that pipe insulation laying around, with the cut it has to slide around existing pipes and the hollow center, I would just think this would collapse....it's also not real firm, so I would think you'd still be at risk for whatever you are trying to avoid.
     
  32. dcamp29

    dcamp29 Monkey

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    OK- got some stuff to report... The lowes foam pipe insulation seems to be closed cell and is cheap. $1.19. We also had a Huck Norris laying around- the HN is significantly stiffer, but pretty thin. I put 2 layers of the pipe insulation in my wheels for now, going to test over the next few weeks.


    2Oz for 2 layers around the rim



    Also came up with this- PEX pipe with foam underneath. Seems like it will cushion (the PEX is flexier than PVC and hopefully won't shatter) and keep the tire away from the sharp aluminum edges of the rim. It's very heavy though and I haven't tried mounting a tire.

    14Oz for 1 wheel


    $20 for everything so far
     
    #32 -   Feb 17, 2017
    Last edited: Feb 17, 2017
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  33. LukeD

    LukeD Monkey

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    Why not go to grainger? You can get thick walled pipe insulation which is closed cell and is unslit.
    https://www.grainger.com/product/K-...=false&searchRedirect=pipe+insulation&sst=All
     
  34. troy

    troy Monkey

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    You should be able to buty an EPDM seal strip like in the pic. below. Guessing by the claimed weight and possible dimensions it should have density around 100kg/m3. Epdm foams like this usually have hardness around 50 shore00. In here 20m long, 40mm dia. strip is around 100usd, but maybe You can get some shorter ones in the US.
     
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  35. slyfink

    slyfink Turbo Monkey

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    My, what lovely hands you have @troy!
     
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  36. atrokz

    atrokz Turbo Monkey

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    subscribed for interest. Stopping running tubeless, but this would help with rolling and pinching/dinging rims. May go back to it seeing how this turns out for you guys.
     
  37. Jm_

    Jm_ Turbo Monkey

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    Or you could use more than 18psi?
     
  38. atrokz

    atrokz Turbo Monkey

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    Even at 30psi the rear tire wants to fold over under hard cornering, which made for some burps, I generally run 35psi in the rear, 30 front, using maxxis HR2's. I don't think I've ever run 18psi in my life. Even my DH bike had 28/24psi with DH tires.

    If these help push the bead against the wall, it could help those of us that ran into burping issues with our tire/rim combo.
     
  39. SkaredShtles

    SkaredShtles I love NEWCASTLE and will ONLY drink NEWCASTLE!!!!

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