Rear rotor failure - ever seen this?

[Hairy]

On 9/23/2022 at 6:26 AM, NotSoBigBen said:

I don't have the experience many here do but I have seen strange wear like that, not broken off though, when a 205mm rotor was used in a 200mm caliper setup.

I was still surprised that the rider didn't notice any strange sounds, scraping of the outer edge of rotor against the metal of the caliper or the pads touching on the little parts of the rotor.

I put 5mm spacers in and solved it that way ..  he's still riding it like that now

Technically you only needed 2.5mm to make up the 5mm discrepancy

[CLC5850]

On 9/24/2022 at 7:48 PM, porqui said:

WOW !!!

Supplier says he sees this on a regular basis - I call BS !!

Surely it must have made a fair amount of noise - would not happen to Avids they'll squeal like a pig in a jiffy.

Must have been an interesting feeling - hope not on the downhill.

 

I had a very fortunate escape falling 1,5m or so into the soft stuff at Northern Farm. Three days before I was coming down from Tiffendell with steepest at 24* so that would have been farewell on many corners which have 50m plus drops. 

 

[LBKloppers]

I once rode down a very long, dangerous and very steep downhill. I mistakenly held the brakes on for too long and the rear rotor cooked. It didn't turn orange. It turned into a deep purple and the rotor warped so bad that I had to take the caliper off to continue my ride. But never, ever did I, under all the gruesome terrains I rode on, experience a rotor fail like that. 

The brand shouldn't make such a difference. The main material is S/S, but S/S or not, neglect or lack of care will wear it down. Whatever the source of the neglect the damage in these photos are due to excessive wear. Don't blame the rotor.

[The Ouzo]

question to the OP, did you do the pro/youtube thing and spray water on your rotor to cool it down ?