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Road Bike Frames, Wheels & Components / Re: Lightcarbon: New LCR017-D (or Yishun R1058-D)
« on: March 12, 2025, 09:32:38 AM »As i am finally getting towards assembly, I noticed that there is a plugged hole on the downtube and I am not sure what the purpose is.
Doesn't seem like a great spot to be missing some carbon, any structural worries necessary?
There’s a discussion a couple pages back in this thread about this. A user reported their frame cracked there. LC responded saying it was caused by thinning of the material during sanding for paint. It’s not an ideal spot to put a hole since the surface is largely under tension from pedaling and holes aren’t as strong under tension as they are compression. The hole for FD mech is “new” looks like it wasn’t on older bikes so only a matter of time to see if other failures occur. That said other manufacturers put a hole there with no issues, it’s just the LC one being in a complex area so only time will tell. The frames are now UCI certified so I hope they did fatigue on the design with that hole for homologation.
Waiting in my frame, so I hope this is not an engineering mistake and it was just a manufacturing error on that one frame.