What could cause this?

[VTECMatt]

This is my 16yo Canyon trial bike, on Friday he mentioned he picked up a stone chip but on closer inspection the metal has been sliced into and is peeling back. The photos don t show this.
I m not a biker so have no idea if this is normal, bad luck or something like the chain or cog cutting in. Must have taken some force to do it.

Thanks in advance.

[Harpoon]

I'd suggest chainsuck but do you get that on 1x drivetrains? I remember my Spesh Rockhopper had a big scar on the frame around that spot but that would have had a 3x chainsaw.

[Holdmyhand]

possible rear derailleur lock up with debris and a quick back pedal causing drive side chain to drop and be caught between chainring and stay?

[Scabutz]

Holdmyhand said:

possible rear derailleur lock up with debris and a quick back pedal causing drive side chain to drop and be caught between chainring and stay?

Definitely this. The chain doesn't look very clean or well lubricated. Reckon it's locked and either chain slap on the frame or it's binded and been crunched by the front ring.

WTF is that ugly weld to the left to it though. Has the frame been damaged and repaired (badly)

[VTECMatt]

Bike is 6 weeks old!

[EmailAddress]

He's jumped, or dropped, and pedaled at the point of landing when the chain has slapped.

[VTECMatt]

Thanks for your help, essentially looks like he is pushing the bike a bit too hard and poor technique. I’ll have fun explaining that to him!