• Is that stuff oily? I find with some tyres if they sit around for a but the sealant reacts with the tyre causing the tyre to release some of its oil content inside and outside the tyre.

    It's kinda gross.

  • Not sure about oily (will check in the morning) but it has tiny air bubbles in it so I assumed it was air leaks and sealant?

  • I think it’s little bubbles of air and sealant escaping through the (porous) carcass. It happens on mine sometimes.

  • Did you use soapy water when mounting the tyre?

    Like TM says, I would say it's just stuff leaking through the side wall. It happened on some Bontrager tyres I had, but they still held. If it's still got some air after "a few months " I'd say that's pretty good really...

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