My main concern with the unbranded carbon equipment from e-Bay is that there's no knowing what kind of quality control is done on the product since we have no real clue as to who is making them. I assume they're coming from the same factories as the branded products but companies who outsource to China are responsible for QC since their name will be on them. It's worth a try I suppose and if they made aluminum bars for cheap I would be tempted to try them since I'm not a fan of carbon bars, stems, or seat posts.
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I like pie