Are these rims toast? Hit a rock.

N00blet
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Are these rims toast? Hit a rock.

Postby N00blet » Sat Jan 20, 2024 4:18 pm

I was absent mindedly cruising at moderate speed (>30km/hr) and didn't see a rock.

I pinch flatted both my tubeless tyres (pinch cut through the side wall against the rim) and the front tyre came off the rim.

Obviously both the tyres are toast. I can see a very small buckle in the front rim wall and an even smaller buckle on the spoke side - is it dead too?

I've remounted new tubeless tyres and they are holding air at maximum pressure (100 PSI)

If this front wheel is toast, would you still use the back wheel if it doesn't have any weird buckles like this? It took a smaller hit given it was the trailing wheel.

#bad day

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OnTrackZeD
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Re: Are these rims toast? Hit a rock.

Postby OnTrackZeD » Sat Jan 20, 2024 5:53 pm

N00blet wrote:
Sat Jan 20, 2024 4:18 pm
I was absent mindedly cruising at moderate speed (>30km/hr) and didn't see a rock.

I pinch flatted both my tubeless tyres (pinch cut through the side wall against the rim) and the front tyre came off the rim.

Obviously both the tyres are toast. I can see a very small buckle in the front rim wall and an even smaller buckle on the spoke side - is it dead too?

I've remounted new tubeless tyres and they are holding air at maximum pressure (100 PSI)

If this front wheel is toast, would you still use the back wheel if it doesn't have any weird buckles like this? It took a smaller hit given it was the trailing wheel.

#bad day

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If it was my bike I would ride them and check them after every singe ride, if they showed any sign of worsting I would bin them.
Now my advice to you is bin them and not risk it.

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P!N20
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Re: Are these rims toast? Hit a rock.

Postby P!N20 » Sat Jan 20, 2024 5:59 pm

Aluminium rims? I’d probably ride them…probably ridden worse.

N00blet
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Re: Are these rims toast? Hit a rock.

Postby N00blet » Sat Jan 20, 2024 7:32 pm

They are CF rims.

I totally understand that any advice to a stranger on the internet about CF must be "bin them"

I am just gathering opinions about whether people would personally ride them to try to gauge moderate risk vs extreme risk :P

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P!N20
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Re: Are these rims toast? Hit a rock.

Postby P!N20 » Sat Jan 20, 2024 7:48 pm

N00blet wrote:
Sat Jan 20, 2024 7:32 pm
They are CF rims.

Oops, forget what I said then.

warthog1
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Re: Are these rims toast? Hit a rock.

Postby warthog1 » Sat Jan 20, 2024 10:03 pm

I would not be riding that on the front.
Fair chance it has delaminated and cracked inside the wheel.
The consequences of a sudden failure at speed, particularly with traffic around aint worth it imo.
I am no CF expert but your life is worth more than a $1000- wheel.
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blizzard
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Re: Are these rims toast? Hit a rock.

Postby blizzard » Sat Jan 20, 2024 10:19 pm

I wouldn't ride that front rim. Did you buy them new? Can you get a crash replacement on it?

lone rider
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Re: Are these rims toast? Hit a rock.

Postby lone rider » Sun Jan 21, 2024 12:24 am

Did you notice the buckle before you fixed the tyre and inflated it?

There is no need to run tubeless tyres at max pressure, it's actually more dangerous than low pressure.

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foo on patrol
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Re: Are these rims toast? Hit a rock.

Postby foo on patrol » Sun Jan 21, 2024 8:03 am

That front is an accident waiting too happen at the worst possible time. :shock:

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N00blet
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Re: Are these rims toast? Hit a rock.

Postby N00blet » Sun Jan 21, 2024 10:13 am

lone rider wrote:
Sun Jan 21, 2024 12:24 am
Did you notice the buckle before you fixed the tyre and inflated it?

There is no need to run tubeless tyres at max pressure, it's actually more dangerous than low pressure.
Didn't really inspect rims regularly until this happened so I am not sure

I inflated at maximum pressure so to "stress test" it to see if it would explode.

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familyguy
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Re: Are these rims toast? Hit a rock.

Postby familyguy » Sun Jan 21, 2024 6:03 pm

Opinion:
CF = toast.

It will likely have a delamination internally that will let go without warning and you'll end up on the road. Painful to think what they cost and maybe they haven't been used much, but it's the best alternative.

Don't take our word for it. Contact Raoul Luescher. He'll tell you for a price.

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Duck!
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Re: Are these rims toast? Hit a rock.

Postby Duck! » Sun Jan 21, 2024 6:42 pm

I would keep riding them, but check them fairly frequently for further deformation. Contrary to popular misconception, they/it will not spontaneously explode, rather due to the complex carbon layup will extend any cracking in a progressive manner. If you find you start losing pressure without an obvious puncture, or it goes out of true due spokes in that area becoming detensioned, they would indicate the rim structure is failing.
I had a thought, but it got run over as it crossed my mind.

caneye
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Re: Are these rims toast? Hit a rock.

Postby caneye » Mon Jan 22, 2024 11:37 am

I might be wrong here but that looks like a Cadex SLR1 hookless wheelset?
If so, shouldn't you be limiting it to 70 psi?

If not .. ignore this.

N00blet
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Re: Are these rims toast? Hit a rock.

Postby N00blet » Mon Jan 22, 2024 2:04 pm

According to giant I think there is no limit for giant hookless wheels with tested tyres

The Schwalbe pro 1 tle is one of those tyres.

In their own testing they inflate to 150% of maximum tyres pressure.

https://www.giant-bicycles.com/au/tire-test-protocol

I inflate to 100psi to just seat the beads. I ride at about 65-75 psi for 28mm front tyre. Maybe if I had more pressure I wouldn’t have pinch flatted.

CmdrBiggles
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Re: Are these rims toast? Hit a rock.

Postby CmdrBiggles » Wed Mar 20, 2024 9:01 am

If they are, as appear, GIANT CADEX SLR1 carbon rims, yes, they require replacement, not further riding to "wait and see".
These rims can take up to 120psi as the upper limit, but sensibly 80-90psi for normal riding; it's 90 for me much of the time.
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Mububban
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Re: Are these rims toast? Hit a rock.

Postby Mububban » Wed Mar 20, 2024 11:02 am

Got any carbon specialists near you who can do a scan?

Very glad you are okay and the front tyre didn't wrap around the wheel and catapult you over the bars :shock:
When you are driving your car, you are not stuck IN traffic - you ARE the traffic!!!

deano2024
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Re: Are these rims toast? Hit a rock.

Postby deano2024 » Sat Mar 23, 2024 5:42 pm

a family member has had a CF wheel explode due to similar causes, I'd find another!

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