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I was doing some side hops on my bike in the park and there was a huge crack and the tubeless tyre lost all its air. (Proper UST rims and tyres) Now this makes me a bit worried. As if you had some speed this would be a catastrophic failure.
Is this to do with the tyre, pressure or just bad luck? I really would not want it to do this going 30mph+ downhill
What pressure were you running? I normally run high around 40 PSI never had a problem with burping. I'd have thought if this was common with UST we'd have heard by now. Scary thought tho.
no problems with 355s and nevegals (tubless version). Done plenty of sidehops and dodgy landings myself.
In the aftermath of a perfectly executed crash landing last year, I found my tubeless front tyre had unmounted, but I cant really say if that was the cause or effect of the crash.
That said, a big snake bite causes a pretty rapid deflation too, so not like tubes remove the risk either.
Pneumatic tyres will always have a risk of sudden deflation, on mountain bikes or other vehicles (see Nigel Mansell's Le Mans crash at the weekend for example).
I run about 38-40 but thinking about it it may have been the Spesh elscar 2bliss tyre that failed which does have thin side walls. I thought it was a pinch but the tyre inflated straight away afterwards.
i've had this happen a couple of times running low pressure. once on front and twice on back. once landing a jump (front wheel) and twice in berms (back wheels). i am running ghetto. 2 of the 3 failures were with tubless specific tyres. one (bonty jones) was so hard to get on the rim and seated (i had to inflate to 60psi just to seat it on the rim) it was bound to fail.
i now run high (45psi ish) pressures on any tubless tyre. the weight saving of single ply tubless over dual ply and tube is worth it i recon. It wouldnt be practical to run high pressures on a HT though as it would be brutal on bumps.
I don't suppose that side-hopping caused this? Will it not push the tyre bead sideways off the rim?
any lateral pressure on the tyre (side hops, hard cornering, dodgy or hipped landings, etc) will increase risk of burping.
straight line impacts are no risk to the tubeless setup.
thats why hardly any dhers run tubless as they are much nore brutal on tyres than xc riders and also generally need to run lower pressures.
I never had any problems when I ran my tyres ghetto, I went back to tubes as it was just a PITA though.
Always burping my front tyre on bad sketchie landing 819 's and tubless will bin them this weekend tbh just a pain in the arse for me as I change gyres a few times a year too
I was wondering if they where used for Down Hill or not. So when people say to use Tubeless in the Alps it is not always the best idea.
A friend of mine has all sorts of problems with his burping running UST, only way he stopped it was running Dual Ply Maxxis & running 40psi-undoing the supposed goodness of tubless being lighter & able to run lower pressures.
I ride the same rides & same times as him using lighter tyres & tubes & don't have the problems..
was so hard to get on the rim and seated (i had to inflate to 60psi just to seat it on the rim) it was bound to fail.
Surely the tyre being a tight fit means its less likely to fail? The tighter it is the more tension its under so the harder it will be to shift it out of the bead?
only had it once where i have noticed at the time, coming off the top of a wall ride and landing off-camber. it made a right racket and a significant amount of air loss. but i do often find after big descents that the rims are slightly wet around the bead from what i presume must be sealant leaking out. never enough air loss to have to top up mid-ride though, but definitely small amounts. ghetto on none-tubless rims with regular tyres in the main. psi around 30-35. don't see the point in running 40+ on a tubeless set up, surely that defeats the point??
-undoing the supposed goodness of tubless being lighter & able to run lower pressures
more air isn't heavier, and tubeless doesn't really mean lower pressures, it means similar pressures will feel less, with a more supple tyre and better grip. The tube can almost double sidewall thickness, that's the difference.
more air isn't heavier, and tubeless doesn't really mean lower pressures, it means similar pressures will feel less, with a more supple tyre and better grip. The tube can almost double sidewall thickness, that's the difference
I'm well aware more air isn't heavier, but many people argue that tubeless does mean you can run lower pressures as can't pinch flat etc.
They're heavier if UST as the tyres are heavier than tubed tyres, especially when he had to go to the extent of dual ply to stop them falling off the rim (EX823)
I run my UST at something like 20psi (ish) and a normal tubed tyre at about 30psi (ish). I have to get it seriously 'wrong' to make mine burp, but it does happen, I just pump a bit more air in trial-side. No real biggie