Rolled into a short, steep, techy section last night. Modulating where grip allowed. Maxxis High Roller Super Tacky on the front blows off the rim, or more accurately the bead unseated, resulting in total and complete pressure loss.

Not ideal.

I tried to re-inflate, but the rim had dug in and picked up mud and pine needles, at any rate I couldn’t get enough pressure with my pump to reseat the bead. I popped a tube in a carried on.

Up until this point tubless has been great.

I have a tubeless ready mud-X out back which ‘popped’ reassuringly onto the rim, this inspired confidence from the off. I’m wondering if there are any tubeless ready tyres out there with similar capabilities to the ST High Roller for up front.

Well, if you can handle the weight, think you can get ST UST high rollers (not LUST though, 60a only).

Or a dual compound HR2 maybe?

Or the speshy things that are basically high rollers in 2bliss?

What rim setup? Maybe you just need a rim strip (or to build up under it) for running regular tyres and getting a good seal.

Setting up a 355 rim tubeless last night and fitting the tyre with a tube to seat the bead when ‘BANG’ – the inner tube exploded ripping a 4 inch hole in it and blew the Racing Ralph completely off the rim.

Fortunately never had a tubeless tyre blow off the rim in 3 years of running tubeless.

What setup is it- rim, exact tyre (carcass and bead) and how you set it up tubeless?

Yeah I’ve never had a tyre blow off either. I’ve always stuck with proper UST tyres and never had a problem.

It does appear that most issues people have when running tubeless is if they’re using standard tyres instead of the intended UST versions.

That would be my first change to recommend 😀

If only Maxxis did UST versions of the particular Miniom DHFs that I like… As it is, I’ve got to run heavy dual plys instead for a reliable setup.

I’m running Stan’s Flows with yellow rim tape/valve/sealant.
The tyre is single-ply, non UST.

Aren’t UST/LUST specific for the Mavic tubeless system?

No they’ll work fine with Stans but on a true UST tyre you’ll pay a weight penalty (even over tubeless ready) as the beading has a bit more to it and it’s made airtight so you don’t need to run sealant (although why anyone would do that I don’t know…).

Op – you start off saying the tyre blew off then you state it unseated. Was it more of a prolonged burp? Ie sudden deflation and the tyre came off as you were slowing?

What pressure do you normally run? Did it feel a bit soft before the problem? Are the rim and bead ok now?

so you don’t need to run sealant (although why anyone would do that I don’t know…).

The Honda DH team ran mavic UST rims + UST tyres with no sealant, as it made for faster tyre changes as they do a lot (and wheel rebuilds etc).

They never had a flat in a race either.

So there’s someone and why 😉

Op – you start off saying the tyre blew off then you state it unseated. Was it more of a prolonged burp? Ie sudden deflation and the tyre came off as you were slowing?

A two or three inch section of the bead came unseated, complete air loss in < 2 seconds. After which the rest of the RH bead came unseated, but still within the walls of the rim. The LH bead was unaffected.

I run low-ish pressure, 25psi by my floorpump guage. Not sure how accurate that is though. It didn’t seem any less inflated than normal, wasn’t squirmy at all, although I hadn’t checked the pressure before the ride.

The rim is fine and the bead looks ok, but I haven’t done a proper inspection, nothing obvious though. It happened early on my ride and I completed with a tube installed, so I imagine it’s OK.

vorlich – Member
I’m running Stan’s Flows with yellow rim tape/valve/sealant.
The tyre is single-ply, non UST.

I’m not surprised by it unseating then. It’s happened to me when using standard tyres. Use UST/tubeless ready tyres and you should be reet.

I believe that with Stans rims you should use a rimstrip if you’re using standard tyres, yellow tape if you’re using UST or tubeless ready. I know many use yellow tape with standard tyres too but as you’ve had an incident like this I’d change to the more secure rimstrip method!

I believe that with Stans rims you should use a rimstrip if you’re using standard tyres, yellow tape if you’re using UST or tubeless ready. I know many use yellow tape with standard tyres too but as you’ve had an incident like this I’d change to the more secure rimstrip method!

There seems to be a lot of conflicting info on STW about this. 😕

I’m still open to replacing the tyre, preferably with a tubeless ready, rather then UST. But may take the rimstrip approach.

This seems like a good excuse to try something else up front. The ST HR is a bit slow, so I thought I could look at something with similar capabilities but maybe faster rolling. Other than Specialised, any other recs?

i have stans flow with bonty XR4 Tubeless ready on the front. I run yellow tape only and never had a burping problem.

I’m running a similar setup OP but with crests instead of flows.

They’ve been perfect for 4 months now but after reading this I’m a little worried, there’s been occasions where a sudden deflation like you’ve experienced would have resulted in a serious off.

How long have you been running tubeless?

chiefgrooveguru – Member

I believe that with Stans rims you should use a rimstrip if you’re using standard tyres, yellow tape if you’re using UST or tubeless ready. I know many use yellow tape with standard tyres too but as you’ve had an incident like this I’d change to the more secure rimstrip method!

Don’t see any need for this myself, as long as you’re not using totally inappropriate tyres anyway (which Maxxis usually aren’t ime). I’ve had a couple of decent sized burps over the years but I’d have to say always at times when I’d not have been surprised to flat a tube either, so I don’t see it as a disadvantage.

I figure if I can race fort william like this, then it works 😉 Put many dings in my rear flow but tyre stayed where it should. (to be fair, there’s places I’d put more side load on than I do at the Fort so in some ways other riding would test it more)

Vorlich – depending on how heavy you are 25 psi may not be much. It may not take much air loss for the tyre to be at a pressure low enough to burp. Sounds to me like more of burp than a blow off but please don’t let my comments dissuade you from buying some new rubber 😉

I run mine at about 35psi and under some circumstances will burp at (est) 30psi.

Get yourself some co2 canisters as they’ll ensure you get the bead seated on the trail. I carry these and the weldite repair strips. Only on longer rides do I bother taking a tube – I’ve not needed one since buying the strips.

In answer to your question….how about a Schwalbe Hans Dampf in the compound softer than the Trailstar? Can’t remember what its called though. Tubeless specific and grip well imo.

I believe that with Stans rims you should use a rimstrip if you’re using standard tyres, yellow tape if you’re using UST or tubeless ready.

Stan would disagree with you.

Never had a problem with normal schwalbe, maxxis or kenda so far.

I thought that with the newer BST designs (crest, arch EX etc) rim tape is all you need. It’s less clear cut with the older BST rims such as the flow. Some get away with tape only but heavier harder riders seem to be more likely to need rim strips.

The only time I’ve had rapid air loss on my crests tubeless was when I pinch flatted the front tyre on a rocky corner with probably far too low air pressure.

There’s that much conflicting and wrong information within this thread I can’t be bothered arguing!
OP – Stick with the yellow tape and try a Maxxis Minion in whatever flavour you want…non-UST will still be fine. If you’ve gone off Maxxis though, I don’t what to suggest but don’t try Panaracer’s.

I am um, what you might describe as a heavier rider. 😮

I’ve just been round to thebikechain and picked up a trailstar Hans Dampf. Got a free water bottle and STW discount too 🙂

Stan says don’t use schwalbe now but I’ve not had any problems. New ones are pretty tight on compared to the old ones though – take some tyre levers in yr backpack.

Been running Stans with yellow tape on standard Bonty and Maxxis for the last 12 months on a 29er running about 20psi on the front and 25psi on the back. Not had a single incident!

Of course, you know what’ll happen now I’ve said that! 🙁