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The reason for that is that if there was a crack there and it was shaped like that, it would be opened outwards and really wide. That would mean something would have to puncture the frame from the inside (something flat) or the frame would have to be opened up. If the crack was there from riding, the only way the crack opened up that much was if the seat tube was snapped in half. It clearly isn't.
Cracks in frames are usually relatively hard to see, as they are closed up when not under load. And fatigue cracks grow for a long while - QED, a friend sent me pics of his chainstay broken literally one hour ago, where 2/3 of the broken weld are smooth and shiny (crack growing and the crack opening and closing back up massaged it to a nicer finish) with the remaining 1/3 being matte - the part that held until the end, when the forces were too high and the chainstay snapped.
This kind of surface finish is crack growth 101.
Joe showing an un-cracked seat tube.
I'm laughing to myself imagining the conversation that led to this video: "Hey, Joe, some internet nerds think your bike is broken... can you please take a video so we can make them shut up?"
Their customer support doesn't seem to be humble, though. My friend had some issues with tolerences on the seat tube, which was not a problem with the frame apparently. It was the seat post. New seat post and still no good fit... I had a bit too tight seat tube when I got my Starling last year. Joe at Starling checked his tooling and found out the go-nogo seat post and sest tube reamer were worn out. Everything was solved, and Starling got their production line fixed. Problem solved.
Meta Power SX already leaked in my Pinkbike Dashboard a few days ago.
I’ve had to warranty a frame recently. The experience was shockingly easy and time effecient. I was already planning on my next bike also being a transition but now it definitely will be. And my riding buddies all also know about the experience and are more likely to buy transitions too. Showing loyalty to customers is a two way street.
https://www.commencal-store.es/PBSCCatalog.asp?ActionID=67174912&PBCATI…
Pics from the Meta SX/Meta Power SX announcement:
For reference/comparison: