fooferdoggie 

this is a DT Swiss 540 rim with maybe 4000 miles on it with tubed tires. our tandems front wheel was getting rebuilt with this exact setup so I put this wheel on ran tubed tires but then realized it will be the same setup so made it tubeless. two layers of dt-swiss tape pulled snug and pressed down very well with the rim cleaned tin alcohol first. the tires went on with no tool like it did on my other rims. brand new Scwalbe marathon almotion tubeless tire on its a 700x38 tire. I have used two of these tires on velocity cliffhangers just fine.
the tire sealed well I used muc-off sealant. set the bead added sealant went riding 20 minutes later it had not lost any air before we rode. 7 miles to the store came out and t was at 30 psi used co-2 rode home. it was low this afternoon like expected filled it to 60 psi (its 50 to 70) and we hoped on got maybe 100 feet and the tire totally blew off the rim. took about 10 feet to stop the bike rolling on the rim. for some reason sealant doesn't to work well on a disc. wife and I hauled the bike back home. I checked I don't see anything wrong with the rim but the damage from rolling on the pavement and the tire looks perfect.

well biked

Too much air pressure for the tire/rim interface to remain air tight, which tubeless tires absolutely require. That's the simplest explanation there is, and it's accurate. As for a more specific cause, there are lots of variables and possibilites.

But back to the basics, I'll add the inevitable anecdote. I run 38mm tubeless tires at 50psi or less, depending on the application, and I've never had one blow off the rim.

edit: I'm gathering from your original post that you were riding a tandem. I love the advantages of tubeless tires, but I don't think I'd run tubeless on a tandem. Two riders, two tires, the requirement for somewhat higher psi in the tires, to me, says says tubeless is not the way to go for tandem riding. YMMV.

fooferdoggie 

the minimum is 50 so I keep it at 60 as I accidentally ran the back at 45 thinking the mim was 45 and got a cut in the bead. been running 60 on the cliffhangers for several months. this rim is a far higher psi rating and the tire is rated to 70 psi. I was thinking heat the wheel was around 80 or so degrees and the pavement was I would say around 90 thats what my Garmin was showing. but on the cliffhanger I have had them to far hotter then that.

well biked

See my edit regarding tandem riding, just my opinion, good luck in getting this sorted-

shelbyfv

Sounds as if it's time to rethink the tubeless choice. It doesn't work out for everyone.

79pmooney

Did you check to make sure the bead line was a uniform height above the rim? (I don't do tubeless but I assume that bead line is there on those tires like it is on all regular clinchers.) That bread line check is the single best way to ensure the bead is sitting a uniform distance below the rim edge. The fact that this tire went on easy means the bead is sitting closer to the edge and that check is more important.

HTupolev

When you first seated the tire, did you make sure that the bead was seated very evenly around the outside perimeter of the rim? If it wasn't, it might not have been snug enough to prevent the bead from crawling... any motion it can make down or toward the rim center can allow the bead to rise up off the rim elsewhere. In that case, the solution is to use a thicker wrap of tape.

Also, did you use wide enough tape? It's a bit hard to tell from the photos, but it looks as though the tape isn't reaching the tire beat seat shelf. On most tubeless rims that need tape, the tape should cover the entire width of the inner bed; DT Swiss recommends using 27mm-wide tape on rims with an internal width of 24mm.

fooferdoggie 

crap just checked the dt-swiss page and they say tubed 80 psi but tubules 59. I did not realize there would be such a difference between the two.

HTupolev

Yeah, inner tubes add substantial safety margin in tire retention.

fooferdoggie 

crap I grabbed the 23 mm tape thats the rim width meat to use the 25mm.

fooferdoggie 

Should I just have their rim replaced or sand it down? I think replace it then take change. it's not too bad but still. how about the tire?
its strange that the fire is rated at 70 psi I doubt that would work with many rims. much below 50 on the back of the tandem was an issue so there is not much room there for air loss.
I may have been fine if I ke[t the psi around 55 but who knows?

Bill Kapaun

ONLY ARTICLES 11654230, 11654059 AND 11654060 ARE TUBELESS COMPATIBLE.
https://www.schwalbetires.com/Marath...otion-11654230


That tire appears to come in a tubed AND tubeless version.
Do you have the correct one?

Russ Roth

To echo Bill, the Schwalbe tires I run have TCS included with the make/model name, yours doesn't, but it should be labeled on the tire somewhere or it isn't. A regular folding bead tire can have the bead stretch without the tube there to hold it.
I've ridden home with a flat before, just take a small file if you have one and hold one hand gently against the rim and lightly spin it with the other hand so you can feel any spots that are sharp or somewhat sharp and give those spots a quick swipe with the file, not need to sand the whole edge.

maddog34

looks like the rim tape is too darn wide, filling up part of the groove that holds the tire in the rim, foofy.

bummer.

start trimming.
or replacing with fresh expensive plastic rim tape.

all to make a super stiff tire feel a tiny bit more compliant... smh.

GhostRider62

Your pressure gage can be inaccurate. Pavement can be 140F and your tires can heat close to that temperature with pressure increasing. Bottom line, you exceeded the pressure limits of the rim.

Iride01 

I question the two layers of tape. Where they the same width tape? Perhaps the second layer didn't let the tire bead lay properly in the bead seat.

But then again, if you were over the pressure recommended, that's the thing to correct first. If it happens again, we all can wonder and speculate some more.

shelbyfv

Wrong pressure, wrong tape, likely wrong tire. Three strikes. A cavalier approach to stuff just isn't right when someone is depending on you for their safety. JMO.

fooferdoggie 

my makita seems to be the same as my topeak and my park tool filler. I know the temp of the pavement as I was kneeling on it and I know the hard way that it has to be 115 degrees to have 135 degree pavement here. yes but why is the tire rated for 70 psi as that seems pretty high for a tubeless tire?

fooferdoggie 

I know that tire was a issue at 45 psi. I wanted them at 50 but that does not give any room for air loss. How would I know its the wrong pressure if your within the tires range? I doubt many people go check on what the pressure range is for a rim.

fooferdoggie 

yes same width. Yes over the pressure of the rim not the tire. Lesson learned that going by the pressure rating on the tire is not always right. going below 50 caused the tire to get a cut on the bead so I had to have some room for air loss. I need to find a tire that can go down to 40 psi.

79pmooney

Idea. Go to a tandem forum and ask what tubeless rim/tire combos. pressures etc. other tandem owners have had good experience with. Tandems are a different beast. Folk who ride them know what works.

fooferdoggie 

ya need a new tire idea. Pissed me off I grabbed the wrong tape dt-swiss does not label their rolls.

Bill Kapaun

Why don't you answer the question I asked in post #12?

fooferdoggie 

Looking at the one that blew off then it is not tubelss compatible. but the first three I have used have that same part number but the website said tubeless. I dont remember for sure as it was last year when I bough them but i thought the box said tubeless ready as I checked the first time. I know the first tire is not labeled TLE but I will compare it with the one I know is not tubeless now. if they are all the same then I have been running the tube version for thousands of miles without issue. Mots Likely the wrong tire caused it though weird they worked another rim.

fooferdoggie 

looks like there is no TLE or such label on the tires. my g-1s dont have them either. so there is no way to know if the first ties I bought are tubeless. the tubed version is a tiny bit lighter.