My aluminum frame failed due to metal fatigue, after less than 20k miles. I wasn't going fast, I didn't hit anything. It had just had enough. Other frames can be repaired. That one hangs on my shop wall.
Test rode a handful of bikes, some of them aluminum, including a CAAD12. Horrible. I spent those years on that aluminum frame just thinking that's how it was supposed to be. But as it turns out, it was harsh and unforgiving. I won't ride aluminum again.
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