I have crashed on my cyclocross bike and got a dent on it's alu frame. I don't see cracks. How serious is this dent? Can it lead frame to suddenly fail? Image 1 Image 2 Image 3 Image 4

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    That poor Focus Mares. I have one as well, the frame seems so sturdy and over-engineered to me that I doubt such a little dent in such an uncritical area would cause any issues. On a sidenote: It’s amazing how resilient the power coating of the frame is. – Michael May 20 '18 at 8:15
  • @Michael, thanks for the answer. I hope so, I think that is at least good that side profule edges (top, bottom, side) are not affected. – Tegoo Tegoo May 20 '18 at 11:32
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    It could lead to failure 10 years down the road, but you'd see some cracks develop first. – Daniel R Hicks May 20 '18 at 12:57
  • My vote is it's OK. The dent is small compared to the diameter of the tube. – Argenti Apparatus May 20 '18 at 16:20
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    I mark potential cracks (apparently only scratches so far) with permanent marker to see if they are getting worse. – Michael May 21 '18 at 14:09

If I interpret the images correctly, that dent is in the upper tube of a diamond frame. This tube only has to withstand pressure, not tension. (When you have a frame failure, it's usually the lower tubes that fail, they are literally torn apart.) As such, I don't think that dent is critical. I'd be more worried if the dent were in the lower tube that connects the bottom bracket with the front.

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