Tire blow out

As per title, I managed to blow a tire out of my wheel in a high speed descent and I'm not so sure how this had happened, but could have ended very very badly.
For context wheels are some rim braked carbon Rovals, brake track a bit worn out. Ridenow TPU tubes and Turbo Cotton tires, again, a bit thin. Was going down a long, twisty descent, temperature was pretty high (I'm in Spain) . I'm a confident descender, I've gone down that mountain, and worse, before and never cooked a rim.
If someone have a decent explanation other than delamination I'm all ears

Well, have you inspected the tubes, tyres and rim? That should give you clues as to the cause.

(I've used Turbo Cottons with no issue but wouldn't touch TPU tubes with a fucking barge pole based on anecdotes from quite a few people now and I'm heavy so wouldn't be using carbon rim brakes in the mountains)

I skidded trough the rim tire and inner tube all flapping about for some terrifying meters until I lost control. Everything mangled but the tire somehow managed another 50k home.
One layer of carbon is peeling from the rim, but could be just the skidding

Hmm, that makes it a bit harder to trace the cause. :) Where were you riding? Are you and the bike ok?

You're assuming the rim let go I guess but the rim delamination could've been after the tyre had gone or the tube or whatever. I've had tyres go bang when I've fucked up and the tube was pinched, I've had them let go when a brake shoe rubbed through the sidewall, they've gone bang when, from what I could tell, a sidewall cut caused the tube to pop out. Oddly enough I've had rims split, but caught them before they popped a tyre/tube.

If you try inflating the tube, what happens? Is there one obvious hole and can you tell what it came from or is it mangled beyond hope?

Is the tyre intact? Or is it shredded too?

I guess if the rim did fail, it could've been either the tube catching the rim or the tyre letting go that let the tube catch the rim or ground. All a bit hard to tell though which order I think.

Good excuse to find some nice alu rims or join us in Discworld (sorry Terry)

Re-read your own post, and I think you might see a few clues as to why it happened 😂

brake track a bit worn out
TPU tubes
Turbo Cotton tires, again, a bit thin
long, twisty descent, temperature was pretty high

I rest my case, your honour.

Something similar happened to @HoKe on his Brompton. Hd faulted the combination of TPU and (overheating) rim brake carbon wheels, iirc.

Glad you’re ok.

I'm just waiting for someone to tell me that the TPU got so hot it went too big and banged. Or some other TPU related accident.
Edit: As said above, that' exactly what I'm thinking . But never had problems with latex before and there's no shortage of hot twisty descents around here.

I've not had issues with latex tubes before but I've avoided TPU tubes based on annecata.

What pressure were you running them at?

They're an absolute arse to fit once they've been used for a while, too

I assume you're experienced enough to not be dragging your brakes all the way down. Did you change anything in your set up recently? How long have you been riding TPU tubes?

@hippy I was on 80 psi for a 25c tire
@jameo I've been riding this with the TPU since the start of the year. I ride pretty often all year round.

Now I've made my peace with having to blow hundreds in another stupid carbon piece I did a more careful examination. The bead of the rim is skidded and rough but there's a big impact in the NDS. Wonder if that happened before the crash?

Yeah that's pretty low compared, i'd be on 110 so even just a sidewall cut could go bang. sounds like you might want some nice new alu rims :)

all my alu rims have4 given fair warning before splitting due to thinness/wear