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The Mystery of the Bead Monster

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6/17/2018 7:54 AM
Edited Date/Time: 6/17/2018 7:59 AM

Riddle me this one Vital Audience...

In the last 24 hours I've had two bead failures. Out of 20 years of riding/racing bikes, I've never seen a bead fail to the point where it is "stretched" and the tire unusable. Now I have two examples in a short amount of time.

Both times the bike was sitting when it occurred. Tire blows off rim. The bead failure is seen in the form of a wrinkle, when you go to put the tire back on the rim, it seems as if you are trying to put a 29" tire on a 27.5" wheel. The bead that blew off becomes ~1" bigger.

Both tires Maxxis. The first one, a DHR II, had been used a bit on a previous wheelset with 0 failures. The other, An Aggressor, was almost new.

Tire pressure low 30s

Wheels are Bontrager aluminum OEM Slash wheels.

Anyone have any thoughts? Wheel? Bad luck? Voodoo magic spell put on me by an ex girlfriend (likely)?

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6/17/2018 11:04 AM

jeff.brines wrote:

Riddle me this one Vital Audience...

In the last 24 hours I've had two bead failures. Out of 20 years of riding/racing bikes, ...more

Voodoo for sure!!

On a serious note, that is the first time I hear about this kind of failure! :0

Do you have any pictures? If it was only one failure I would go for a defect in the rim structure... But here 2 times seems really strange...
Did you often ride on the rims?? (Following a flat or whatever)

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6/18/2018 5:39 AM

Very similar thing happened to me 2-3 years ago, had never seen such a failure and then 2 occurred over a couple of months (in my case it was from a side impact to the tyre causing it to ballon up in one area).

I have read about this happening with a couple of maxxis tyres shipped with Commencals recently, probably just a bad batch of tyres...

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6/18/2018 6:02 AM

Eoin wrote:

Very similar thing happened to me 2-3 years ago, had never seen such a failure and then 2 occurred over a couple of months (in ...more

So basically the Tire effort on the bead caused it to fail? Wouaah, was not thinking it could happen.

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6/18/2018 7:48 AM

Damn! Wrong kind of beads. I was going to recommend stringing them on 80 lb. test marine fishing leader line with the long crimps. Your necklaces will still wear out and eventually break, but it takes A LOT longer than regular nylon or thin beading wire.

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6/18/2018 7:56 AM

Photo attached for reference. The "wrinkle" is where the bead has broken. Photo

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6/18/2018 8:04 AM

Just wanted to add - rim is in perfect shape. Never had a flat prior to this. Both tires purchased at very different times (1 year apart). As I noted, one had seen ~500 miles of use. The other, 30ish.

Its bizarre.

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6/18/2018 9:17 AM

Weird, in my case it was more the sidewall than the bead, but I think the issue was pretty similar: I guess that whatever lining is inside the rubber has ripped leading to overly strechy tyres?

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6/18/2018 11:44 AM

did you use tire levers to get the tires on? if so, was it difficult? could a lever have stretched or injured the bead where you're seeing the fold? i have no idea, just curious if you noticed anything extra difficult or easy during mounting

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6/18/2018 12:49 PM

sspomer wrote:

did you use tire levers to get the tires on? if so, was it difficult? could a lever have stretched or injured the bead where ...more

actually this is a really good question/point...

I didn't notice anything crazy during mounting but I was going fast and used my old Intense DH tire lever...(more like a moto lever)

Maybe that did it?

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6/19/2018 8:49 AM

Minnaar? Bruce Klein (in Fontana)? Dean Lucas(at ft bill)?

Been hearing some chatter and there seems to be some smoke but maybe some journalists could do some digging.

Clearly a touchy topic on several levels...

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