Rear wheel buckle.

[wafter]

That damage seems very odd - must have taken a lot of force to distort the rim so much, yet there are no obvious impact / abrasion marks in the area of damage while the tyre appears fine and evidently remained inflated.

Was there anything on the inside / bead seat of the rim that might give us a clue as to what happened?

Also, beware ally work-hardening. IME you can often bend stuff back to close to where it started, however this will weaken it and the closer you get to the starting point the more brittle it will become. I had this with the bars on my Routier - the closer to "correct" they got the more the load required to bend them seemed to ramp up exponentially... I suspect if I'd pushed them all the way they'd probably have snapped or perhaps started bending elsewhere.

 

[Binky]

That damage seems very odd - must have taken a lot of force to distort the rim so much, yet there are no obvious impact / abrasion marks in the area of damage while the tyre appears fine and evidently remained inflated.

Was there anything on the inside / bead seat of the rim that might give us a clue as to what happened?

Also, beware ally work-hardening. IME you can often bend stuff back to close to where it started, however this will weaken it and the closer you get to the starting point the more brittle it will become. I had this with the bars on my Routier - the closer to "correct" they got the more the load required to bend them seemed to ramp up exponentially... I suspect if I'd pushed them all the way they'd probably have snapped or perhaps started bending elsewhere.

Yeah it's odd. I'd just crested a short but very steep climb, there was a slight downhill and I braked for a bend after a flat section and was aware something definitely not right. No indication before of issue and I hadn't gone into pothole.
I straightened it out yesterday and had a short 20 mile ride today. It's fine but not perfect and as you say I'm reluctant to do much more with it as aluminium will only take so much before weakening too much.
I'm planning on new bike in a couple of weeks but I'll keep this as back up so I'll aim to source a replacement wheel when a bargain comes around.

 

[SuperGalactian]

That's way too high. It says on sidewall Max 116 psi

All the sizes of the GP5000 have recommended minimum pressures. For those with maximum 116, the minimum is either 85 or 95psi.

 

[Binky]

All the sizes of the GP5000 have recommended minimum pressures. For those with maximum 116, the minimum is either 85 or 95psi.

I suggest you go to Silca or a similar site, enter in total system weight etc and see.
95psi way above requirement.

Also check out various GCN videos on tyre pressure.
From what you are saying I suggest you are probably running your tyre pressure way too high.
Don't take my word for it though, go check.

Also it was wheel rim that got damaged, I didn't puncture and no damage to tyre which would be far more likely if pressure was too low which it wasn't.

 

[C R]

I suggest you go to Silca or a similar site, enter in total system weight etc and see.
95psi way above requirement.

Also check out various GCN videos on tyre pressure.
From what you are saying I suggest you are probably running your tyre pressure way too high.
Don't take my word for it though, go check.

Also it was wheel rim that got damaged, I didn't puncture and no damage to tyre which would be far more likely if pressure was too low which it wasn't.

For the rim to hit something to damage it like that the tyre needs to be squashed enough for the rim and the something to come into contact. Higher pressures make that encounter less likely.

 

[SuperGalactian]

From what you are saying I suggest you are probably running your tyre pressure way too high.
Don't take my word for it though, go check.

OK, I’ve just done that. The Silca calculator suggests 101/102 psi for my everyday bike. I actually use 100 front and back.

However, the calculator doesn’t take into account the specific brand of tyre. As tyres are designed quite subtly, I listen to what the manufacturer advises. For those currently in my stable:
Michelin Pro 87-116 (my everyday bike)
Vredestein Fortezza Senso 115-175
Schwalbe Marathon Plus 60-95
Conti Ride Tour 70- 80 psi

If you choose to ignore the manufacturer and ride on lower psi, it seems to me obvious that you risk rim damage.

 

[Ajax Bay]

I suggest you go to Silca or a similar site, enter in total system weight etc and see.
95psi way above requirement.
From what you are saying I suggest you are probably running your tyre pressure way too high.
Don't take my word for it though, go check.

The Silca calculator suggests 101/102 psi for my everyday bike. I actually use 100 front and back.
However, the calculator doesn’t take into account the specific brand of tyre. As tyres are designed quite subtly, I listen to what the manufacturer advises.
If you choose to ignore the manufacturer and ride on lower psi, it seems to me obvious that you risk rim damage.

@SuperGalactian - we don't know tyre width or system weight of @Binky so you are 'shooting blind'.
100 psi seems extraordinarily high but perhaps you are running 23s and are 16 stone, in which case fine.
Conti suggests a "recommended" pressure for their 5000s. Is this a minima? Imho it's b****x - without specifying load. Maybe they are 'aiming off' for the litigious median 'American' male recreational rider.
70F and 80R here for system load 85kg on 5000 28s,

All the sizes of the GP5000 have recommended minimum pressures. For those with maximum 116, the minimum is either 85 or 95psi.

https://www.continental-tires.com/products/bicycle/tires/grand-prix-5000/

 

[SuperGalactian]

@SuperGalactian - we don't know tyre width or system weight of @Binky so you are 'shooting blind'.
100 psi seems extraordinarily high but perhaps you are running 23s and are 16 stone, in which case fine.

Fair comment. But to me, 65psi for a performance road tyre seems 'extraordinarily' low.

I am on 23x622 and weigh 11 stone. Total weight with steel frame bike is 81.3 kg. Poor paved road surfaces, mid-range tubed tyre, and choose the ride how you like. Try it in Silca and see.