this post was submitted on 03 Jun 2025
43 points (100.0% liked)
Bicycles
4003 readers
15 users here now
Welcome to [email protected]
A place to share our love of all things with two wheels and pedals. This is an inclusive, non-judgemental community. All types of cyclists are accepted here; whether you're a commuter, a roadie, a MTB enthusiast, a fixie freak, a crusty xbiking hoarder, in the middle of an epic across-the-world bicycle tour, or any other type of cyclist!
Community Rules
-
No bigotry - including racism, sexism, ableism, homophobia, transphobia, or xenophobia.
-
Be respectful. Everyone should feel welcome here.
-
No porn.
-
No ads / spamming.
-
Ride bikes
Other cycling-related communities
founded 2 years ago
MODERATORS
you are viewing a single comment's thread
view the rest of the comments
view the rest of the comments
Holy. Ballz. Between you and @[email protected], this is starting to resemble a generalized design flaw. DerPlouk's break looks like more like a stress riser, whereas yours looks like an HAZ. Aaaannd that is the about the outer limit of my metal failure analysis skills.
Are there any welders or metallurgists in the house? I would love to read a failure analysis of how and why this happened right at that spot.
Strain-stress for aluminum had a finite lifetime limit, so after X stress over the life of the part it will break, where steel is almost infinite as long as it's below the per instance maximum
Someone aluminums!
I mentioned this to chatGPT earlier, and it correctly guessed the exact location where the frame cracked, so I assume it’s simply a high-stress zone. Makes sense though - when I’m sitting down and bouncing over heavy rocks and roots, that’s the part of the frame that takes the brunt of the force, preventing the rear triangle from folding in.
I’m not the smallest guy, and I usually have a heavy backpack on, which surely doesn’t help either. That being said - the frame is rated for 120 kg, and I stay well below that, so it's most likely a manufacturing defect.