This happened while i was sat watching sweary Dave's ht550 video
I brought it inside after reinstalling a sloppy weather tyre in the garden.
Wasn't a good idea putting 60psi in then bringing it into the warm. It was somewhat loud.

Oh ffs!!!!!
It's worse than that: The rim is nackered :(

Oh no! That's some force there. Often considered tubeless but cost/mess always concerned me. Can the rim be mended?

60psi on a wide rim not a good move, even temporarily for seating!

Richard G wrote:60psi on a wide rim not a good move, even temporarily for seating!

Yeah, I know that now........
It's been fine the last couple of times. Lesson learned.
Face.palm.

bikeandbivvy wrote:Oh no! That's some force there. Often considered tubeless but cost/mess always concerned me. Can the rim be mended?

Doubt it. Will see what it looks like once I've stripped it down.

I've had a couple of bad tyre/rim combinations and had tyres explode at 25psi. Worst one was in the kitchen with sealant on the ceiling, walls, cupboards, there seemed to be 10 times more sealant than I'd put in.

Carbon rim?

jay91 wrote:Carbon rim?

No it's a wtb scraper.

techno mail wrote:

jay91 wrote:Carbon rim?

No it's a wtb scraper.

WTB Scrapper more like.
Just looking at the photo closeup has that failed at the weld or however the the rim is joined?
Seems odd that the rim would fail each side in a similar way.
I think I would be having a word with WTB if so.

Mariner wrote:

techno mail wrote:

jay91 wrote:Carbon rim?

No it's a wtb scraper.

WTB Scrapper more like.
Just looking at the photo closeup has that failed at the weld or however the the rim is joined?
Seems odd that the rim would fail each side in a similar way.
I think I would be having a word with WTB if so.

Defo a scrapper!
It did go off like a bomb, my heart was pounding from the shock of the volume.
The rims not welded, just pinned. and the wheel is practically pringled. got a serious wobble on.
I reckon if i told WTB i'd put 60psi in it they're not going to honour any warranty.

I had that happen me but thankfully the rim was ok. The noise from it though! It was like someone had detonated something right beside me. I had a ringing in my ears for a couple of hours.

spindicator wrote:I had that happen me but thankfully the rim was ok. The noise from it though! It was like someone had detonated something right beside me. I had a ringing in my ears for a couple of hours.

Thankfully I had my rubber ear buds in listening to a video and they attenuated the blast quite a lot so no ringing ears. Scared the crap out of me though!

Imagine the mess if you'd added glitter to the sealant

The rims not welded, just pinned. and the wheel is practically pringled. got a serious wobble on.
I reckon if i told WTB i'd put 60psi in it they're not going to honour any warranty.

The vast majority of rims are pinned and not welded and I think you are right about the 60 psi. Out of curiosity, what were you using for rim tape?

Brave man admitting to that.

A friend of mine managed to get a tyre to blow off, the bang made the freehub and cassette fall off a DT hub. That was before I, I mean they were aware they were tool-free to get off.

Just out of interest, what is the rated maximum pressure for the rim? 60psi isn't that much and with the accuracy of the gauges on some pumps - my Park track pump being a good example - I could reach just over 50 psi indicated and actually have 60 psi in the tyre? On the flip side I have also used a friends pump and the gauge said 25 psi but my digital gauge said about 16.

If the rim failed like that at 60 psi that's not much safety margin. I've seen a tyre explode off a rim at 70 to 80 psi (2.2 wide Conti) but other than the sealant spraying all over the place neither the tyre of rim visibly were damaged. That rim joint may have been defective.

Bearbonesnorm wrote:Imagine the mess if you'd added glitter to the sealant

Ermmmmm....
At least it was pink glitter and having 3 craft and art mad kids no-one will ever notice!

ScotRoutes wrote:

The rims not welded, just pinned. and the wheel is practically pringled. got a serious wobble on.
I reckon if i told WTB i'd put 60psi in it they're not going to honour any warranty.

The vast majority of rims are pinned and not welded and I think you are right about the 60 psi. Out of curiosity, what were you using for rim tape?

T-rex tape.

sean_iow wrote:Just out of interest, what is the rated maximum pressure for the rim? 60psi isn't that much and with the accuracy of the gauges on some pumps - my Park track pump being a good example - I could reach just over 50 psi indicated and actually have 60 psi in the tyre? On the flip side I have also used a friends pump and the gauge said 25 psi but my digital gauge said about 16.

If the rim failed like that at 60 psi that's not much safety margin. I've seen a tyre explode off a rim at 70 to 80 psi (2.2 wide Conti) but other than the sealant spraying all over the place neither the tyre of rim visibly were damaged. That rim joint may have been defective.

Max pressure rating in the paperwork is 45psi.
And the pressure in the rim was 60(ish)psi while in the garden.
It was around 6°C outside so once it'd warmed up to 18C in the house I dunno what the pressure would have been.

FWIW I use Scraper i45s on my Plus bike. Normal tyre pressures would be around 16-18psi. That rim is rated at 45psi max, so I might go near that looking to seat a tyre if I had to (not needed to so far).

Use of the correct tape helps too as it is very shiny/low friction and will help the bead slide into place.

johnnystorm wrote:Brave man admitting to that.

A friend of mine managed to get a tyre to blow off, the bang made the freehub and cassette fall off a DT hub. That was before I, I mean they were aware they were tool-free to get off.

I'm sure your friend learned his lesson pretty quick

techno mail wrote:

johnnystorm wrote:Brave man admitting to that.

A friend of mine managed to get a tyre to blow off, the bang made the freehub and cassette fall off a DT hub. That was before I, I mean they were aware they were tool-free to get off.

I'm sure your friend learned his lesson pretty quick

Yeah, once the ringing in his ears stopped.

Odd mode of failure - I'd have expected the rim beads to split away (like what happens on rim brake rims when they are worn out), not for it to come un-pinned. Can you force the pin joint back together again?

htrider wrote:Odd mode of failure - I'd have expected the rim beads to split away (like what happens on rim brake rims when they are worn out), not for it to come un-pinned. Can you force the pin joint back together again?

It's not pulled apart lengthways if you see what I mean.
Will look at the state of the rim once it's stripped down.
I'm not hopeful as it is somewhat pringled.

Edit:
No, its beyond repair. That's an 1.5" gap.