Blowout!

autobahn

Anyone any ideas what would of caused this?
I had taken my new bike out for only its second run yesterday and did lots of hills and had a good burn out.
I put my bike in the car and whilst driving home an almighty bang happened deafning me for a few seconds. It seems my tube had burst.
The front tyre had been forced of the the rim with the tube split right along its seam. This was a good 30 mins into my journey home.
What would of caused that? My tyres where inflated to about 110psi (the tyres are Conti Ultra Sport- max psi 120)
Could it be due to having a cheap inner tube which seemed to come with the bike?
One thing I am wondering is that I dont have a bike carrier and have to out my bike in the car by putting the seats down, its a tight fit but it goes on ok. When putting my bike in the car, I dont remove the wheels as it fits with them still on, though have to manouevre it so front wheel sitting upright just behind my driving seat at 90 degree angle!
Perhaps its doesnt like that! Or perhaps it was just a one off occurrence!
Any ideas or thoughts are much appreciated.

Bunneh

I'm not sure but I know when I put a tyre and tube back on my old bike, then pumped it up, the tube was trapped at the rim and caused it to explode. I am thinking that maybe it was slightly trapped (?) and was fine when you were riding, but when you put the bike in the car the increase in temperature caused the air in the tube to expand making the tube explode.

I'm afraid my science phd never arrived so I'm likely completely wrong

Doombrain

both of my tubes burst on the first ride. cheap sh1te them evans used, some Taiwanese make

mattward1979

Instantly thought of a poorly fitted tube... if there is a pinch on the rim, a sideways knock on the tire as you put it in the car could have ruptured the tube and blown the tire from the rim..

When you replace it make sure you use the tire levers to push the tube well into the tire before you jam the last section on to the rim

blackhands

Was the wheel in the sun - its likely to get very hot as there's no moving air to cool it down and the air in the tube will expand sufficiently to blow the tyre off the rim - I've had this when carrying spare wheels for someone in a 12 hr TT.

sungod

i'd bet on the trapped tube, it stops the tyre seating correctly, then in the car it got the right extra shove to lift the bead off the rim and blow

olddgreg

When this happened to me (tube burst while i was eating lunch) I bought some better tubes and it has never happened since. Seems like a common problem with cheap tubes.

balthazar

There's nothing wrong with the tube, which exploded when it was outside the tyre. Either the tyre bead wasn't properly seated in the rim – because the tube was partially trapped under it, or otherwise; or alternatively, it may have been pressure increase caused by the hot car, as blackhands wrote. I'd place them as about equal possibilities on the account you gave. Either way, the inner tube is not to blame.

marcandre

this happened to me whilst out on the bike, i wanted to blame poor quality products.

But i know that i didnt insert the inner tube correctly, must have been pinched around the rim. oh well we learn from these experiences.

Monty Dog

When bikes are assembled, in humid conditions in the Far East by the time they arrive here in the UK, the inner tubes often become stuck to the inside of the tyre - when inflated for the first time, they are often trapped under the bead, but because the inner can't move, it creates a weakness that suddenly fails. When buying a new bike, remove the inner tubes - they usually need to be 'peeled' away from the outer - talc them and refit.

turnerjohn

sounds like the rim tape has moved exposing a hole under neither...can happen with rubbish rim tape. (dont get the prob with UST rims tho :-) ) would suggest (like everyone else here) remove the tires and talc the tube / tyre first. Remove the rim tape and put some Velo (sticky) rim tape onto the rim. Its much thicker and being stuck wont move...seals the wheel far better....

The Mechanic

he same think happend to me twice whilst I was riding, once front, once rear. I thought at the time that it was pore quality tubes but they were specialized and I have not had problems with them before. The wheels were brand new the first time it happed on the front wheel but it was later in the year when the same think happened on the back wheel. On that second occasion we had left our bikes locked to a post at the ferry over to Cape Wrath and it happed just a few seconds after riding off when we returned. Could have been hte sun exposure thing. I was hoping it wasn't a problem with the tyre/rim combination but no further problems so far.

BTW, tyre is Conti 4 seasons and rim is Ambrosio Evolution. I have never had fitting related issues before but I guess there is a first time for everything. Uber careful since.