• Newly fitted 2nd hand g one all rounds. Went up pretty easy, lost a bit of air overnight, but seemed ok after a top up and a bit of spinning around. Took them out for a test ride. All fine up until about mile 15 when I was pootling along on the flat, on road, and the front tyre randomly burps sealant. I thought a bird had shat on me at first and then I clocked how pink it was. Didn’t think much of it, until around mile 25 when I’m going downhill - again, on flat, on road - at about 35mph and it happens again, twice in quick succession. Shat myself at that point, slowed right the fuck down, was almost home anyway.

    Definitely not normal, but can I chalk it off as just a bit weird or do I regard it as sinister and likely to lead to fiery burning death?

  • Would give me the heebie jeebies that.

    I know it's awfy simple but did you pump them right up on first fitting to max psi? Get some pings?

    Perhaps a rim width compatibility issue? Although I'm not sure the G One range has very stringent guidelines on that having ridden them.

  • Which rims?

  • Whoa wtf that should not be happening! Were they easy to go on (as in maybe a bit loose)? I'd pump them right up and look for anywhere along the rim not nice and flush, any swerve in the line of the tyre, make sure lots of pings as it seats in case it's that/.

    But I would be very worried that happening on a downhill, and if you don't find something wrong to explain it i'll send you your money back

  • how much sealant, and is it dumping a bit of pressure at the same time ? could just be the bead pinging into place if they didnt do that as Stoo61 describes, but this would only flick out a v tiny bit of sealant.

    I concur on the heebie jeebies. I did have a pair of G-One Ultrabites burst off the rim a while back. Oddly, both on the front wheel and miraculously both while I wasn't riding. I'm still a fairly die-hard schwalbe user as this has really been the only time, but it was pretty scary. The bead actually snapped on them, was nuts. /csb

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