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I suffered pinch flats a couple times that put a hole in the tyre (sidewall/edge of tread) too large for the sealant to fix.
This is what was happening to me...in cross. Your pressures were too low and tyres not robust enough I'd imagine.
Out of curiosity, if you're having to fit a tube on the road/trail, what do you do with the sealant?
Stans reckon their gloop is environmentally OK. The times in cross where I've bothered to fit a tube to get home there's been so little sealant left I haven't had to do anything with it.
The new Schwalbe TR stuff goes up like a clincher, real easy.
Howard-
Your pressures were too low and tyres not robust enough...
Not sure about tyres not robust enough, cheap Conti mtb tyres so the heaviest/least supple casing I'd have thought.
As for pressure, yeah, lack thereof was definitely to blame for the pinches but isn't that why you run tubeless in the first place? Now that I'm back running tubes I don't feel I've had to increase pressures massively.
I dunno, maybe it was a combination of my weight, my bike being completely rigid and my riding style being umm...unsympathetic(?) that led to my issues or just makes it less of a benefit to me. My mtb is as far from weight weeny as you can get so I guess the weight savings weren't noticeable/appreciated, especially since I was adding the weight of a few wraps of tape and a split 20" tube anyway.
Also, I kinda figured that since I wasn't confident enough in the sealants ability to keep me rolling and was still carrying spare tube(s) when riding then I may as well just have tubes in the tyres all the time and save the faff of dealing with the mess of sealant.
M_V
Tried tubeless on my mtb but didn't get on with it.
I suffered pinch flats a couple times that put a hole in the tyre (sidewall/edge of tread) too large for the sealant to fix.
1st time the tyre was half worn so didn't mind that it had become unusable (for tubeless), second time was on a tyre that was only a week or so old. I chucked the sealant, went back to a tube and haven't regretted it.
Out of curiosity, if you're having to fit a tube on the road/trail, what do you do with the sealant? Dispose of it in an environmentally sound way? The twice I got pinches I called it a day, rolled back to the car and sorted it at home.
I was doing ghetto/diy installs with split tubes and struggling to get inflated with a normal track pump, one of those Bonty ones may have helped me get along with it. Don't think the nature of my install had anything to do with the pinch flats by the way.