While out for a ride this morning, my attention drifted from the road until a slight thunk followed by metallic ringing snapped me back to the task at hand. It was on a downhill stretch, and I was moving at near 30mph, so the softening of the tire became apparent in short order. A puncture.

I hoped it would seal, and continued on a bit, but it wasn't getting better, so I pulled over. I inspected the tire, but saw no indication of a puncture or of one being sealed. Puzzled, I found the valve stem a bit loose, so I chalked it up to coincidence (the piece of metal in the road) and pulled out the pump to air it up.

That went fine, until I unscrewed the pump hose...taking the valve core with it! Whoosh! Dead empty, but the S-One's beads stayed locked into the AC Victory30 rims, which they hadn't done before. I guess they "bedded-in" over time. Nice. I put the core back in and pumped it up again.

Having done so, the puncture in the center of the tread hissed, but no sealant came out. I rotated the wheel to make sure I wasn't trippin', but nope, wasn't sealing. So I deflated and pinched the beads loose, preparing to put in an innertube.

Looking inside the tire, there was no liquid sealant. I guess it was back in December when I setup these wheels, so around 8 months ago, too long, apparently for the porous Microskin casing. I'd never experienced such a thing running Ones, but it does make sense, I guess. Note to self: check sealant every 6 months at least.

Tube went in fine, and I rode another 20-some miles before I punctured again! Fortunately, leakdown was slow, and I was able to ride the remaining couple of miles home. Bad luck, there, though I did have a patch kit.

Anyway, I hope my experience is helpful in understanding tubeless tires and how they are different, something which I didn't fully grasp untill now

Happy riding!