Inner Tube Explosion - Why?

Papa Smurf
Papa Smurf Posts: 776
edited April 2008 in MTB general
I was changing my tyres over earlier... Nothing new there. My Nokian Tubes fit the XC pro tyres fine and I was just pumping away as normal, I noticed a VERY slight S shape in the tyre, but I assumed that was from where it was stored (pushed into a box that's slightly too small).
I always feel and move the tyre at numerous points when pumping up but at about 23psi my inner tube blew up, leaving me with a nice 5inch gap that blew open with such force it blew my tyre off the rim!

What could I of been doing wrong? The inner tube wasn't caught under the tyre, it wasn't twisted and I didn't over pump it. The tyre only had a slight twist, not an uncommon site when a deflated tyre is on a rim.

Here's a pic:
March08set12003.jpg
Specialised Hardrock
Gt I-Drive XCR5

Comments

  • cee
    cee Posts: 4,553
    pfff....

    I dunno, but that nice star shape would suggest manufacturing flaw (weak spot) to me.
    Whenever I see an adult on a bicycle, I believe in the future of the human race.

    H.G. Wells.
  • mr mangos
    mr mangos Posts: 174
    That's what you get for using a Presta valve. :wink:
  • NikB
    NikB Posts: 243
    That pressure doesn't sound very high to cause such an explosion assuming the tyre was seated properly. If this hasn't happened before I would think it was just a dodgy inner tube.
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  • uk_mr_brownstone
    uk_mr_brownstone Posts: 343
    it'd be quite a laugh to see if you can repair it with multiple patches!

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