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Tubeless tire pops off the rim after inflation (sans valve core)

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  • March 30, 2018 at 12:04 pm #28306
    terrycojones

    Hi all

    I’m trying to get a 35mm tubeless tire (Compass Bon Jon Pass) mounted on  a FLO wheel. I have an AirShot2 (http://www.airshotltd.com/product/airshot-2/ – great product BTW), with which I can get the tire to pop onto the rim, but only if I remove the valve core (which is what I have done in the past with other tires). My problem is that when I disconnect the AirShot and the air comes out, the tire pops back off the rim and can no longer be inflated with a track pump when I put the valve core back in.

    In order to get the tire to pop on I had to lubricate its wall and the rim so they’d seal more rapidly/well. I first did this with some washing up liquid and later thought that might be part of the reason the tire pops back off the rim when I deflate. But the same happens when I use just a bit of water.

    So I’m a bit stuck. Has anyone been in this situation before? My next step will probably be to take off the tire, clean everything, and try again. I’m a bit reluctant to do that though as I already have sealant in the tire and would prefer it if things Just Worked. I’ve had a couple of tubeless tires on this wheel before but not run into this (or any other) problem in getting them mounted.

    Thanks for any thoughts / tips!

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  • March 31, 2018 at 8:56 pm #915835
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    Mathemagician

    Sounds like you’ve got the
    Sounds like you’ve got the problem sorted…when I used the airshot without a valve core, I’d top up the pressure using a pump on the airshot, and just stuck my thumb over the exposed valve after unscrewing the airshot, quickly screwing the core back in. Managed to keep about 30psi still in the tyre that way, which was plenty enough to keep it on the rim.

    March 31, 2018 at 8:12 pm #915833
    0
    matthewn5

    Johnnystorm wrote:

    Johnnystorm wrote:
    matthewn5 wrote:

    Gosh tubeless sounds like a faff.

    Go tubular if you want to get messy fitting tyres, or stick to tube, do yourself a favour!

    It seems like a faff because youve read this post of when it was a faff. I’ve run tubeless whenever possible since 2011 and it’s usually no bother at all, I haven’t posted up each time it’s gone well! :)

    Cheers,  might give it a try some time. I read accounts that you needed to change the sealant regularly and knowing from tubs how messy and sticky that stuff is, I thought I’d give tubeless a miss!

    March 31, 2018 at 6:44 pm #915831
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    Johnnystorm

    matthewn5 wrote:

    matthewn5 wrote:

    Gosh tubeless sounds like a faff.

    Go tubular if you want to get messy fitting tyres, or stick to tube, do yourself a favour!

    It seems like a faff because youve read this post of when it was a faff. I’ve run tubeless whenever possible since 2011 and it’s usually no bother at all, I haven’t posted up each time it’s gone well! đŸ™‚

    March 31, 2018 at 5:14 pm #915829
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    matthewn5

    Gosh tubeless sounds like a

    Gosh tubeless sounds like a faff.

    Go tubular if you want to get messy fitting tyres, or stick to tube, do yourself a favour!

    March 31, 2018 at 5:06 pm #915827
    0
    mike the bike

    terrycojones wrote:

    terrycojones wrote:
    …… Thanks for the replies – I was starting to think no one would say anything due to tubeless not being such a big deal in the road world. I’m trying the Bon Jon Pass after reading this glowing review of the Barlow http://road.cc/content/review/237487-compass-barlow-pass-tc-tyre which includes “the Compass Bon Jon Pass, a 35mm version of the Barlow Pass, is one of the five fastest tyres in the world”. Hopefully they’ll be fast for me too đŸ™‚ 

     

    Coincidence or what?  I’ve just finished reading the recent review of the Bon Jon Pass tyre on my favourite tyre website – bicyclerollingresistance.com.  Although they agree it’s a fast tyre in the touring world it wouldn’t get in the top fifty of road tyres, and it rates extremely poorly for puncture resistance.  I bike-tour most years and I wouldn’t touch this one, but hey, it’s your choice.

    March 31, 2018 at 10:37 am #915825
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    Miller

    If you have trouble getting

    If you have trouble getting the tyre to seat it’s always worth trying another layer of tape.

    March 31, 2018 at 9:12 am #915823
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    terrycojones

    SteveAustin & SpikeBike –

    SteveAustin & SpikeBike – just saw this, thanks a lot – good advice.

    As it happens I’d decided to leave the tire inflated (with AirShot attached) overnight to see if it would help, and it did. It still popped off, but only a little when I very slowly deflated it, and I couldn’t pump it up with the track pump. But I tried again with the AirShot, this time with the valve core in, and it took!  So I’m all good to go now, I think.

    Steve – I’m using Orange seal, and also their 60mm Versa valves (expensive but a really good product, much better in terms of valve-hole sealing possibilities than typical cheaper valves).

    Thanks for the replies – I was starting to think no one would say anything due to tubeless not being such a big deal in the road world. I’m trying the Bon Jon Pass after reading this glowing review of the Barlow http://road.cc/content/review/237487-compass-barlow-pass-tc-tyre which includes “the Compass Bon Jon Pass, a 35mm version of the Barlow Pass, is one of the five fastest tyres in the world”. Hopefully they’ll be fast for me too đŸ™‚

     

    March 31, 2018 at 7:34 am #915821
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    AfterPeak

    +1 for SteveAustin advice on
    +1 for SteveAustin advice on smearing sealant on the bead. Also if it is inflated when with your airshot thing can’t you just leave that attached for half an hour? Probably just the tyre needs to be held in shape for a bit

    March 31, 2018 at 4:00 am #915819
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    SteveAustin

    is it popping off at the same

    is it popping off at the same point?

    what sealant are you using? some sealants aint man enough for the job ime. Stans is great.

    Smear some sealant on the bead of the tyre, and try again, i leave stubborn wheels on their side sat on a  bucket whilst inflating, so can see where the leaks are, and give them another wipe with fairy solution, and pump them up higher than you need to. some tyres need a lot of pressure to fully @pop@ onto the rim.

    a couple of mtb tyres ive had over time have needed a tube fitted and pumped to 20-psi more then usual and left over night to seat properly

    Just read a review of them tyres, they are loose, so try more pressure to get them to @pop@ on. gl

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