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Is it safe to ride on this wheel?

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Is it safe to ride on this wheel?

Old 07-22-20, 03:41 PM
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rower2cyclist
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Is it safe to ride on this wheel?

I just noticed there’s carbon deformation on my rear wheel. I am told that it was caused by exhaust heat (I recently traveled and the bike was on the rack)

Is this wheel still safe to ride on? I put the bike on the same rack same position many dozen times and this never happened before. Maybe I never noticed it before but pretty bummed to see the wheel like this on top of other issues I have been having lately.


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Old 07-22-20, 03:55 PM
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I wouldn't do anything without asking the wheel manufacturer. Contact Giant and ask them. If you are seeing that, the wheel got hot enough to soften the epoxy and deform the wheel.
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Old 07-22-20, 04:04 PM
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If you have to ask.....
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Old 07-22-20, 04:26 PM
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Originally Posted by rower2cyclist View Post
I am told that it was caused by exhaust heat
Any more to the story? Sounds as if someone (shop?) explained what happened, did they offer an opinion? The only way I can imagine it would be safe is if the wrinkles are only in some cosmetic, tape-like layer. Probably only Giant could tell you.
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Old 07-22-20, 04:41 PM
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Just for the sake of curiosity, can you feel the ripples?

Regardless, I can't imagine riding on a wheel that was heated to the point warped. That means its structure was weakened and changed...
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Old 07-22-20, 05:35 PM
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Originally Posted by Bah Humbug View Post
Just for the sake of curiosity, can you feel the ripples?

Regardless, I can't imagine riding on a wheel that was heated to the point warped. That means its structure was weakened and changed...
Agree
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Old 07-22-20, 05:47 PM
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My sister in law did that to an aluminum wheel. Burned the tire off and distorted the rim.
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Old 07-22-20, 05:52 PM
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How would the wheel get that hot but the tire apparently is untouched?
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Old 07-22-20, 06:00 PM
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Impressive the continentals survived this

I would ride these for commuting at 25kph

not descending at 90kph

another reason to buy EVs. ICE cars destroy bikes.
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Old 07-22-20, 06:03 PM
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Originally Posted by rubiksoval View Post
How would the wheel get that hot but the tire apparently is untouched?
Who said that it’s not a new tire?
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Old 07-22-20, 06:07 PM
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Originally Posted by dr_max View Post
Impressive the continentals survived this

I would ride these for commuting at 25kph

not descending at 90kph

another reason to buy EVs. ICE cars destroy bikes.
Or, you know, put the bike in the trunk.
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Old 07-22-20, 07:13 PM
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rower2cyclist
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Originally Posted by InvertedMP View Post
I wouldn't do anything without asking the wheel manufacturer. Contact Giant and ask them. If you are seeing that, the wheel got hot enough to soften the epoxy and deform the wheel.
That's just what I did. I will let you guys know when I get a response.

Originally Posted by shelbyfv View Post
Any more to the story? Sounds as if someone (shop?) explained what happened, did they offer an opinion? The only way I can imagine it would be safe is if the wrinkles are only in some cosmetic, tape-like layer. Probably only Giant could tell you.
Yes, when I took the bike to the shop to get the hub fixed, a shop employee over there noticed it and told me it was OK to ride on. Well, I trust his judgment but I also like to get a second opinion on these kinds of matters. The deformation area is over pure carbon, not on tape like layer FTR. I contacted the Giant and expecting a response hopefully in the next few days.

Originally Posted by Bah Humbug View Post
Just for the sake of curiosity, can you feel the ripples?

Regardless, I can't imagine riding on a wheel that was heated to the point warped. That means its structure was weakened and changed...
I won't be riding on these but yes, you can def feel the ripples.

Originally Posted by dr_max View Post
Impressive the continentals survived this

I would ride these for commuting at 25kph

not descending at 90kph

another reason to buy EVs. ICE cars destroy bikes.
Or get a better rack. I had been meaning to get one for a long time now will def get one before I travel with the bike again.

Originally Posted by AdkMtnMonster View Post
Who said that it’s not a new tire?
I had maybe 500 miles on the tires so yes they are fairly new.
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Old 07-22-20, 07:20 PM
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Is that a carbon faring rim with a AL core or full carbon? If you take the tire off, is there shiny metal inside? If it's a faring wheel, I wouldn't sweat it.
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Old 07-22-20, 07:24 PM
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Not a chance I’d ride on that wheel. I’m surprised it even remained true.
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Old 07-26-20, 01:50 PM
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I'm a mechanic at a Giant shop--and I'd bet a considerable sum of money that Giant would not say that's safe at all. That's a full carbon rim and the layup is compromised.

Unfortunately the damage is not related to riding so it does not quality for Giant's Carbon Confidence program. If they have a replacement rim in stock you should expect to pay for it and a rebuild of the wheel or for a new wheel, which may or may not be less expensive.
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