My mate Inbred 29er is bent, looking from the back the whole rear end is crabbing. The point at were it seems to have failed is the small mono section of tubing at the seat stays.
It never has been in a crash, it just ‘seemed’ to go mid ride.
It’s an 18″ and he is about 12.5 stone.
Ideas why it’s gone.

Huge pedalling power?

“Huge pedalling power?”

No I’ve never ridden it.

Could an out of whack rear wheel cause it?

I doubt that would actually bend the frame, but it could make it APPEAR bent I s’pose…..

This frame IS bent, not subtle but proper bent.

all 29ers are bent.

All 29er riders are bent.

“all 29ers are bent”

The riders or bikes?

Both

All that power, that’s what does it.

Suspect a badly made frame.

On-one then?

Mmm double check by placing a long straight edge on the head tube it should rest on the seat tube and end up somewhere near the drop out. Measure that distance then do the samething on the otherside of the frame. You should be looking at about +/- 5 mm differance anymore than that give On One a shout, they do offer a “crash” replacment service