Carbon wheels delaminating?

General bike chat that does not fit elsewhere
graememacd
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Carbon wheels delaminating?

Postby graememacd » Sat Aug 19, 2017 10:18 am

I recently bought some carbon clinchers from a reputable wheel builder (not one that frequents these forums). I set them up as tubeless but the rear would lose pressure sometimes over a day other times over several days. I tried re taping the rims to rule that out but it kept happening. After one ride I noticed Tyre sealant on the brake track but didn't think anything of it. After my last ride I checked the wheels the next day and found the sealant residue shown in the picture. Is that the brake track delaminating?
They have only done 250 miles and the wheel builder has had them back and told me they're fine while ignoring the photos I've sent. They also said they will only refund 60% of the value.


Image

trailflow
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Re: Carbon wheels delaminating?

Postby trailflow » Sat Aug 19, 2017 14:02 pm

Never seen that before. Is the sealant leaking out from the bottom of the brake track ? If you squeeze the rim does the gap open up and leak more ?

That doesn't look fine. How can it be normal ? Looks like a manufacturing fault.

I think they should replace the rim or wheel or refund.

60% refund is also not on. You could name and shame.

graememacd
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Re: Carbon wheels delaminating?

Postby graememacd » Sat Aug 19, 2017 14:24 pm

trailflow wrote:Never seen that before. Is the sealant leaking out from the bottom of the brake track ? If you squeeze the rim does the gap open up and leak more ?

That doesn't look fine. How can it be normal ? Looks like a manufacturing fault.

I think they should replace the rim or wheel or refund.

60% refund is also not on. You could name and shame.


The rim doesn't open up if you squeeze the brakes but it's quite clear that it's leaking. There was another section of the rim where it was the same. They did offer to replace the rim initially before they had them back but said it would be 3-4 weeks before they would have any more in stock. Since they've had them back they have blamed the stans tape I used saying it was to loose. I taped it twice to make sure after it lost pressure, plus that wouldn't make any difference.
I won't name and shame (yet) as the build quality was good but if they stick to their story I will contact trading standards

Lookyhere
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Re: Carbon wheels delaminating?

Postby Lookyhere » Sat Aug 19, 2017 14:50 pm

graememacd wrote:I recently bought some carbon clinchers from a reputable wheel builder (not one that frequents these forums). I set them up as tubeless but the rear would lose pressure sometimes over a day other times over several days. I tried re taping the rims to rule that out but it kept happening. After one ride I noticed Tyre sealant on the brake track but didn't think anything of it. After my last ride I checked the wheels the next day and found the sealant residue shown in the picture. Is that the brake track delaminating?
They have only done 250 miles and the wheel builder has had them back and told me they're fine while ignoring the photos I've sent. They also said they will only refund 60% of the value.


Obviously faulty and equally obviously not very reputable at all....name so we can all avoid.

If you paid by CC you can make a claim against the CC provider ie Halifax, lloyds etc etc

You ll get no-where with trading standards.

graememacd
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Re: Carbon wheels delaminating?

Postby graememacd » Sat Aug 19, 2017 14:57 pm

Unfortunately I paid via bank transfer so no come back. I wish I'd paid through their ebay shop now. I have threatened them with trading standards so will see what their response is before naming them

trailflow
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Re: Carbon wheels delaminating?

Postby trailflow » Sat Aug 19, 2017 15:15 pm

Any reason why you don't want to wait 3-4 weeks for a replacement? or do you want a full refund ? or have they backed out of the deal ?

graememacd
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Re: Carbon wheels delaminating?

Postby graememacd » Sat Aug 19, 2017 15:20 pm

Because I have my best bike sitting there with no wheels on it. Plus I'm not sure I trust the rims. Anyway they seem to think that the rim is fine even with the evidence so not sure the offer is still on the table. They have offered to send them back but I have to pay for their rim tape which they've added

thecycleclinic
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Re: Carbon wheels delaminating?

Postby thecycleclinic » Sat Aug 19, 2017 15:29 pm

sealant leakage can happen if the tape does not seal the rim that for the tyre is not sealaing against the rim properly. Witht he tyre deflated does the tyre fall away from the rim.
there is some wet marks just above the brake track and just below the tyre. could the leak be from the tyre rim interface.

Delamanination is not what I am seeing there would be a crack or something obviously wrong with the carbon.

I suspect this a tyre rim problem not a delamination problem. If the wheel is true and round there nowt wrong with the rim.

you can trust the rims though. Is this a tubeless compatible rim we dont even know that.
Last edited by thecycleclinic on Sat Aug 19, 2017 20:49 pm, edited 1 time in total.
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graememacd
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Re: Carbon wheels delaminating?

Postby graememacd » Sat Aug 19, 2017 15:33 pm

The Tyre does not fall away from the rim when deflated and yes they are tubeless rims

thecycleclinic
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Re: Carbon wheels delaminating?

Postby thecycleclinic » Sat Aug 19, 2017 15:44 pm

well even so it still might be a tyre/rim interface problem given the sealant just below the tyre. the brake pads remove the sealant from the brake track.

I still cant see any evidence of delammination. not all rims are tubeless compatible as they should be and sometimes it is the tyre.

The wheel builder maybe right by not offering a full refund there maybe nothing wrong with the rim. have you tried another tubeless tyre for example.

Letting the retailer sort the problem is not a bad option I would let them. maybe they can set it up for you so it holds air and does not leak.

Also no offence here but I get number of wheel issues which turn out not to be the wheel but something over looked y the customer like Q/R used e.t.c. So dont rule out the taping. just because you have done it twice does not mean that it done right. It may not be the tape also but dont rule it out either.

I also would not name and shame it would not be fair as the cause of the problem from these pics is highly uncertain.

If your really worried sent it me. I will have a go a taping it and sealing the tyre. I will even ride the thing and if I never get back to you its because the rim killed me. otherwise I will send it back. you will know then if it is the rim or something you have over looked.

In short be less worried about the rim, carbon does not just crumble into dust. look for the simple cause rather than assuming it is the wheel which in my experience is the default cause identifed by customers even though the fault maybe something else.
Last edited by thecycleclinic on Sat Aug 19, 2017 15:58 pm, edited 1 time in total.
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graememacd
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Re: Carbon wheels delaminating?

Postby graememacd » Sat Aug 19, 2017 15:56 pm

There was no evidence of the Tyre leaking at the rim and this happened after the ride with the bike stationary

thecycleclinic
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Re: Carbon wheels delaminating?

Postby thecycleclinic » Sat Aug 19, 2017 16:04 pm

so whats that in the photos below the tyre then? looks like sealant marks to me.

I can see the problem. Look very closely the tyre is not seated properly it looks taller to the right of the photo than on the left. If I am right in this (I may not be) over inflating will allow the tyre to pop into place and seal properly.

Some soapy water when installing the tyre will help avoid this in future if this is the cause.
http://www.thecycleclinic.co.uk -wheel building and other stuff.

graememacd
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Re: Carbon wheels delaminating?

Postby graememacd » Sat Aug 19, 2017 16:11 pm

It looks like one sealant mark but doesn't explain the rest of them. Think I'll stick to handbuilts in future....

thecycleclinic
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Re: Carbon wheels delaminating?

Postby thecycleclinic » Sat Aug 19, 2017 16:36 pm

what about the way the tyre is sitting is still looks like it is sitting low. If that is right then the rim is not at fault.

you are looking for problems what may have very simple causes. there is no evidence of rim delamination so rule that out until there is.
http://www.thecycleclinic.co.uk -wheel building and other stuff.

trailflow
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Re: Carbon wheels delaminating?

Postby trailflow » Sat Aug 19, 2017 16:44 pm

I agree the tyre looks to be not seated properly. I'm leaning towards the pads wiping away the sealant which leaked out of the tyre. That's why there is big spot where the tyre is at it's loosest and a couple of small wet spot at the top of the brake track directly inline with the rest underneath. And most of it seaped to the bottom of the brake track. Then the wind smudged it across the rim.

If there is a hole at the bottom of the brake track, then surely there is another hole somewhere inside the rim bed you could check. Try shining a torch in the rim bed, in theory the light should shine through and come out of the hole if there is one at the bottom of the brake track.

Delamination is where the bead hooks/brake track overheat,melt,weaken,warp, causing it to widen. And usually happens at the top of the brake track. To check, measure how wide the rim beads are at various point along the rim. Both inside and out. You might want to take the tyre of to do it properly. Alternatively you could spin the wheel and look next to the brake pads (adjust them closer) and eye ball it for any bulging. Similar to checking how true a wheel is.

graememacd
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Re: Carbon wheels delaminating?

Postby graememacd » Sat Aug 19, 2017 20:31 pm

Looks like that might be the case, I'm having the wheels back anyway. Thanks all for the input

cougie
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Re: Carbon wheels delaminating?

Postby cougie » Sat Aug 19, 2017 20:39 pm

Yeah I'm going with the tyre rim interface. It's the most obvious explanation.

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ugo.santalucia
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Re: Carbon wheels delaminating?

Postby ugo.santalucia » Sun Aug 20, 2017 07:10 am

I am thinking why I have never sen carbon wheels used in Formula 1 or similar... I remain to be convinced that carbon fibre is a suitable material for tubeless

graememacd
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Re: Carbon wheels delaminating?

Postby graememacd » Sun Aug 20, 2017 10:29 am

ugo.santalucia wrote:I am thinking why I have never sen carbon wheels used in Formula 1 or similar... I remain to be convinced that carbon fibre is a suitable material for tubeless


F1 wheels are magnesium as carbon fibre is banned in the regs. Not sure if it's a safety thing or for cost though

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ugo.santalucia
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Re: Carbon wheels delaminating?

Postby ugo.santalucia » Sun Aug 20, 2017 10:39 am

graememacd wrote:
ugo.santalucia wrote:I am thinking why I have never sen carbon wheels used in Formula 1 or similar... I remain to be convinced that carbon fibre is a suitable material for tubeless


F1 wheels are magnesium as carbon fibre is banned in the regs. Not sure if it's a safety thing or for cost though


Probably they don't like the way it shatters, but a lot of the rest of the car is made out of it, so hard to say. Or maybe they are not considered safe for tubeless.

Did you know lorry tyres go up to 120 PSI? :shock:


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