Had a big off on Friday and it looks to have been caused by my front wheel burping and losing all its sealant and pressure.
Is there any way if preventing this happening again ?
I don't run low pressure as I'm quite heavy and don't like the feel of the tyres squirming about.
Cheers.
If you are not running low pressure and your forks aren’t locked out then I’d suggest the only thing that’s help is a tyre insert. I have no experience of them so can’t advise past this point
When you say not low, what are we talking.?
Must be rim/tyre type combo. Run ~30psi here and never had a burper.
DT Swiss e1900 wheels
Maxxis dhf 3c eco
32psi or thereabouts
Not sure of sealant make.
32 or thereabouts? Is that measured with a gauge or off a pump? Or?
I run mine about there and gave never once burped a tyre. I'm lighter that you, but still far from light
I've got quite a decent track pump (can't remember name now)
It's my first ever burp and one I'm not keen on repeating 😃
Is more sealant likely to help b
Sealant can definitely help with “gluing” the bead, so def worth a try.
(ps. can’t speak for the tyre/rim combo, cos I’ve never used those 😉)
How often do you need to change tyres?
Another layer or two of tape will make the rim/tyre bead fit tighter.
32psi is quite a lot in a front tubeless set up unless you’re a very aggressive rider and/or very heavy?
115kgs.
I'm not sure about the rim strips as the bike came set up already tubeless
insert
even if you do de pressurise you will still have control
think nukeproof ard, cushcore, or my favourite, ratbite
I've not ridden for a while but my wheels are EX511 rims (29") with Maxxis dhf WT 2.5" tyres.
Tubeless with one revolution of tape and 25 to 30 psi.
120Kg and not seen any burpage.
Also have 2.8" Nobby Nics on 40mm rims on my HT. Run them tubeless @ 15 to 20psi and they too have held up no problem.
Are you sure they tyre wasn't deflated slightly / not sealed before it happened, as 30PSI is a fair pressure for them to burp.
I'm not sure if it was just a freakish one off and due to landing slightly off.
Also I'm not sure of the make of the sealant but it does weep from the sidewalls quite a bit ??
Rim is 30mm internal diameter.
Don’t take this the wrong way...
From the other thread, it sounded like you screwed up on a jump? It seems more likely that you landed skewiff and came down hard on a wheel that was turned slightly? I’m not saying you can’t burp causing a crash, but I am skeptical here.
As ever, you’d benefit from more time riding and less time worrying about kit.
Edit: just seen your post ^^^. Agree.
115kgs here, only ever had one true 'burp' on tubeless, on a berm going in hard, rear wheel that was under pressurised. As I shrlapped like a riding god around the berm, I could feel the tire roll a bit then 'BURP', whoosh, bugger.
If your tire was losing air, that could explain it. But you would have felt the 'roll' before the jump.
I have had a Minion DHR II (dual compound, not 3C) fail at the sidewall/bead interface before, that felt like a burp, and once the tire was deflated was hard to see.
Check your tire for that failure?
However, as above, sounds like you were unlucky.
Some rim/tyre combos will be more likely to burp but perhaps you have a slightly baggy bead on your tyre. Or it's just a freak incident. As others have said, with your setup you wouldn't expect to be burping the tyre so I wouldn't be worrying too much about it happening again.
I had my first burp today! That’ll learn me to say I’ve never had one!
I know it was a freakish one-off though, so certainly won’t be faffing about with inserts... pressured to get down a track by a prick on an MX bike, my back tyre hit a big, sharp root. Would’ve definitely been a pinch flat situation with tube setup, but just burped air out and once I’d pumped tyre back up, all ok. Will top up the sealant cos I can see it leaked round the bead.
I would think you had a puncture at some point prior and had lost some air, as a burp at that pressure seems unlikely.
Never had a burp, weigh more than the OP, and use the same wheels.
I did roll a (non TL) tyre off the rim landing a sideways bunnyhop many moons ago, which resulted in a burst tube and me being on my arse. It was a little soft at the time though.
Nothing more to add, and I’m not even sure it’s useful anyway.
Superficial +1
With all due respect, from everything you described, I think you landed hard with the front tyre at an angle, that spat you off, and the burp was a symptom, not the cause.
Stop trying to buy things when what you need is practice.
I wonder if the wayward / sideways landing itself caused the tyre to depressurise rather than it being a true ‘burp’. I’m lighter than you but the only time I had one was when I’d forgotten to pump the tyre up to the right pressure before riding and when I went hard into a berm it rolled and burped. Must have been sub 20 psi before I started.
If you’re really worried about it then put an insert in it - that tyre / rim combo should be fine and you’ve got a decently wide internal rim there. Not sure which insert is the best at holding the beads tight against the rim.
I’m going to be running a 2.6 Forecaster on my new hardtail for more volume than I usually run on the rear (2.3) and it’s a slightly flimsier tyre. Thinking about running a rimpact in there as they’re pretty cheap. Maybe the more hardcore version of the rimpact might do a job - or some of the inserts listed above.
32 psi is not particularly high pressure if you weigh 115 kg. That's like a 70 kg rider running 20 psi. If you're jumping and landing sideways, you can get small burps that steadily lower the pressure without realizing what's happening until eventually it rolls enough to suddenly deflate.
Edit. And gauges often read several psi off too.
Ah I guess its one of them things.
Just something I don't want to repeat as my shoulder is still in bits now !!
Stop trying to buy things when what you need is practice.
This.
Don't be so harsh fellas... i'm sure you/we all buy plenty of crap.
It could be about how you're riding - one of our riding group is extremely agressive in corners and is forever burping his. He's a damn good rider and that's just his style. The rest of us aren't as quick, but are less agressive, and I can't remember anyone else burping.
If you want to spend some cash, could be worth investing in a digital pressure gauge - in my experience track pumps aren't very accurate, and a digital gauge helps you know exactly what you're running so you can keep track of when you find a pressure that's too low for you.
Check the tyre closely before you use it again.
When my fat arse did this, it damaged the sidewall which consequently let go catastrophically in my bathroom while i was holding it underwater in the sink trying to work out why it wouldn't stay inflated.
Sounded like a shotgun going off and looked like the aftermath of a specialist movie.
Stop trying to buy things when what you need is practice.
This.
To be fair I'm not trying to buy anything if I don't need it. I asked if the tyre inserts prevent the burping?
As Im getting more confident on the bike it seems to want to go faster.
Don’t be so harsh fellas… i’m sure you/we all buy plenty of crap.
No one is being harsh, quite the opposite tbh, lots of decent advice.
But, if you're 115kg and you say, keep going over on your ankle, what would you do? buy new boots?.
OP has had one burp, because he landed a drop poorly, you don't buy kit based on all eventualities, that's all folk are saying. I'm sure renton wants honest opinions, not sugar coating.
No point sugar coating!
In fact Ive just re read the thread and Ive not even asked about tyre inserts, I asked about more sealant.
You won't stop a tyre burping if you land like that renton mate, shit happens, and sealant choice won't help either. Some tyre and rim combos aren't the best, but you only really find this out for yourself.
Spesh and Maxxis are the only brands I've really burped in 10 years of being tubeless in various forms, Schwalbe and WTB have been pretty faultless.
Tried a few different sealants too, always come back to stans.
Check the tyre closely before you use it again.
When my fat arse did this, it damaged the sidewall which consequently let go catastrophically in my bathroom while i was holding it underwater in the sink trying to work out why it wouldn’t stay inflated.
Sounded like a shotgun going off and looked like the aftermath of a specialist movie.
I did pretty much this on the patio. Frantic panic to wash off all the jizz before it dried, ears ringing for days.
I've only ever burped two tyres.
1. On my old Commencal Meta HT. Pressure too low trying to sail around a berm like a god 🙂
2. Built my Intense Spider up, then went off an awkward drop and landed on an off-camber grass verge. To be fair it was an older tyre and that finished it off! Once I'd taken all the grass from between the tyre and the rim, it was completely mis-shaped!
I'm a bit of a unit at around 15stone 10lbs, but not usually heavy on kit weirdly.
Cushcore will lock the beads into place to stop this happening. But like some of the others, I think the crash caused the burp rather than vice versa.
Also, don’t trust pump gauges, they can be miles off. The Topeak digital one is good.
Wider rim
Tyre burping can be a real problem when taking corners at speed and wider rims are the solution by stopping the tyres from being so squirmy at a given pressure.