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Recreational Cyclocross and Gravelbiking This has to be the most physically intense sport ever invented. It's high speed bicycle racing on a short off road course or riding the off pavement rides on gravel like :The Dirty Kanza". We also have a dedicated Racing forum for the Cyclocross Hard Core Racers.

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Old 09-30-09, 07:57 AM   #1
bdcheung
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Catastrophic failure: help identify cause

I was riding my CX bike to work this morning, riding it along the packed-dirt trail that parallels the asphalt MUP.

As I'm riding I hear a "thud thud thud thud thud thud BOOM" with the boom being my rear tire going flat.

here's what the tube looks like:


Any idea what could have caused this?

Tires are 700x35 Maxxis Locusts. Wheels are Soul S4.0. Tubes are Bontrager 700x35-44c
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Old 09-30-09, 08:25 AM   #2
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First give me 15% off my Hammer order.
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Old 09-30-09, 08:26 AM   #3
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clink the link
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Old 09-30-09, 08:26 AM   #4
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Looks like a faulty tube.
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Old 09-30-09, 08:33 AM   #5
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Oh, and a flat tire is not a "Catastrophic failure". This is:
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Old 09-30-09, 08:49 AM   #6
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Quote:
Originally Posted by bdcheung View Post
I was riding my CX bike to work this morning, riding it along the packed-dirt trail that parallels the asphalt MUP.

As I'm riding I hear a "thud thud thud thud thud thud BOOM" with the boom being my rear tire going flat.

here's what the tube looks like:


Any idea what could have caused this?

Tires are 700x35 Maxxis Locusts. Wheels are Soul S4.0. Tubes are Bontrager 700x35-44c
Wow I've never seen anything like that. A blown tube! Who would have thought? It's another of these JRA (just riding along) incidences that I've heard about.

Last edited by Saddle Up; 09-30-09 at 08:53 AM.
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Old 09-30-09, 08:51 AM   #7
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mayb someone doesnt like you?
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Old 09-30-09, 08:55 AM   #8
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Originally Posted by Saddle Up View Post
Wow I've never seen anything like that. A blown tube! Who would have thought? It's another of these JRA (just riding along) incidences that I've heard about.
Feel better now?
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Old 09-30-09, 09:07 AM   #9
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how does the bead of the tire look?

I have seen some Maxxis cross tires with some shoddy looking beads, and if the bead came off the rim a little bit that would explain the thumping and then when enough tube got through that would explain the tube blowing out
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Old 09-30-09, 09:12 AM   #10
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how does the bead of the tire look?

I have seen some Maxxis cross tires with some shoddy looking beads, and if the bead came off the rim a little bit that would explain the thumping and then when enough tube got through that would explain the tube blowing out
+1

I had that type of flat with my ritchey speedmax tires. The tire bead unseated and started to bulge to the side, thus the thud thud thud sound of the tire/tube hitting the frame. These tires were way loose on my rims; I could put them on with no effort with one thumb. Needless to say, I no longer ride these tires.
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Old 09-30-09, 09:30 AM   #11
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It may indeed be a tire issue. I'd been planning on putting mud2's on, guess I'll prioritize that now.
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Old 09-30-09, 09:50 AM   #12
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yeah, i've seen that before several times. always been the bead coming off the rim. sounds like a gunshot.
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