Tire sidewall blowout failure
09-23-20, 10:58 AM
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Tire sidewall blowout failure
Seems that after all the good things I have said about the GP5000 tires and the fact that it is 2020, I need to have a healthy serving of crow.
Yesterday I was riding laps of a parking structure and after riding up and down for an hour I went home. On the way home I heard a loud "pop" followed by the sick feeling of a flat tire. I now can say that on at least one occasion, a GP5000 running tubeless stayed seated on the rim after a blowout failure. The failed tire was on the rear of my Ritchey Breakaway (solo).
The picture is a bit fuzzy, but hopefully you can see the bead visible outside of the rubber part of the tire.
I did check the CPSC web site and there has not been a recall of the GP5000 tire, so I expect this is not a recurring issue, but has anyone else here seen this kind of failure with a GP5000? I normally ride with 105 PSI front and rear, but I failed to check the pressure before riding, so from the pressure drop I have been seeing on this wheel tire combo,the tire was probably running about 80 PSI. The tire in question has maybe 1500 miles on it. I was using Orange Seal Winter formula. Ambient temperature was about 80F. Road surface when the failure occurred was concrete. Rider and bike weight was 250 pounds. I checked the brakes on both bikes I use that wheel set on, and the brakes were clearly not rubbing on the tire.
It looks like the Kevlar bead detached from the tire. Any thoughts on what may have caused this? Low pressure? Heat buildup? Impact damage? Sidewall cut? Just because?
Yesterday I was riding laps of a parking structure and after riding up and down for an hour I went home. On the way home I heard a loud "pop" followed by the sick feeling of a flat tire. I now can say that on at least one occasion, a GP5000 running tubeless stayed seated on the rim after a blowout failure. The failed tire was on the rear of my Ritchey Breakaway (solo).
The picture is a bit fuzzy, but hopefully you can see the bead visible outside of the rubber part of the tire.
I did check the CPSC web site and there has not been a recall of the GP5000 tire, so I expect this is not a recurring issue, but has anyone else here seen this kind of failure with a GP5000? I normally ride with 105 PSI front and rear, but I failed to check the pressure before riding, so from the pressure drop I have been seeing on this wheel tire combo,the tire was probably running about 80 PSI. The tire in question has maybe 1500 miles on it. I was using Orange Seal Winter formula. Ambient temperature was about 80F. Road surface when the failure occurred was concrete. Rider and bike weight was 250 pounds. I checked the brakes on both bikes I use that wheel set on, and the brakes were clearly not rubbing on the tire.
It looks like the Kevlar bead detached from the tire. Any thoughts on what may have caused this? Low pressure? Heat buildup? Impact damage? Sidewall cut? Just because?
Last edited by DangerousDanR; 09-23-20 at 11:02 AM. Reason: update pressure info
09-23-20, 08:06 PM
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I had that happen with the top-end Gavia tires a few years back. The shop exchanged them as a manufacturing defect.
