Warning danger possible explosion!! ust

mzungo said:

OK now i have your attention you can have a laugh at my expense but there is a serious side to this post...

I was fitting a new UST tyre, and i have always listend for the tyre ping on to the bead to now it's fitted correctly only this tyre did not ping and i was not paying attention, anyway i look down at my pump air gauge and oh **** i am at 80 psi when bang the tyre blows clean of the rim making my ears hurt like hell and raping me accross the knuckles of one hand ....Jesus did i Sh1t my pants...

pay atention people these things can pop if you dont... and injury could result.:yikes:

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Yes pumping a tubeless bike tire above 60psi is not a good idea and you may have (permanently) damaged the bead by forcing it over the rim. Be very careful of that tire or just replace it if you like to be on the safe side. (The cost of a tire is dwarfed by the cost and involved in medical emergencies should you become injured if that tire looses a bead while you are riding)

Any bike tire (any tire FTM) can explosively deflate if it is over pressurized (either by blowing out a sidewall or by popping the bead. You can also loose a bead on a tube tire if the bead is not set evenly around the rim.

Could be an expensive mistake .....

Grumpy said:

Yes pumping a tubeless bike tire above 60psi is not a good idea and you may have (permanently) damaged the bead by forcing it over the rim. Be very careful of that tire or just replace it if you like to be on the safe side. (The cost of a tire is dwarfed by the cost and involved in medical emergencies should you become injured if that tire looses a bead while you are riding)

Any bike tire (any tire FTM) can explosively deflate if it is over pressurized (either by blowing out a sidewall or by popping the bead. You can also loose a bead on a tube tire if the bead is not set evenly around the rim.

Click to expand...

Could be an expensive mistake .....Is it normal for UST tyres to not make a pop noise as they setle?

mzungo said:

Could be an expensive mistake .....Is it normal for UST tyres to not make a pop noise as they setle?

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Did you lube the sidewalls with soapy water or something like that? It usually helps them seat properly.

mzungo said:

Could be an expensive mistake .....Is it normal for UST tyres to not make a pop noise as they setle?

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Usually but not always. It depends on the tire and how much soap you have on the bead. I had a tire (specialized) that would pop on one side but slide in on the other. (the UST spec says that "a popping noise is sometimes heard")

What you need to do is raise the pressure to 50-60 psi and then inspect the bead for proper seating (you can manually assist by rolling the tire slightly) if the bead won't seat deflate and put more soap suds on the bead and re-inflate (and check for proper bead seating)
Ideally, I leave the tire inflated to 50psi over night and then deflate the next day to check for a properly seated bead (it should not come loose even though the tire is deflated) and then inflate to the proper pressure.

Always inspect a tire (tube or tubeless, UST or not) for proper bead seating after mounting and initial inflation. (I take tube tires up to 15psi and then manually set the bead even around the edge)

i belive that to qulaify as a UST tubeless tire, the tire must be able to stay on the rim at 72 psi, although some are rated for more.

Steve