Trek does not recommend a repair or patch of a damaged carbon tube or part. To explain why, let’s use a bike frame as an example. A modern Trek carbon bike frame doesn’t work like a collection of tubes and lugs; it’s designed to function as an integrated unit. This integration allows the structure to distribute and share forces across the entire structure. In other words, force applied to the downtube will be spread out so that all tubes get a chance to absorb it and the force on the downtube is greatly reduced. This is the key to making a lightweight frame that is still stiff and strong enough for top-level competition.
Adding a carbon ‘patch’ to a frame tube changes the tube’s stiffness and shock absorption characteristics. This change in stiffness can affect the tube’s ability to absorb or transfer impact energy. In an impact, an overly-stiff patched tube might abruptly transfer all the force to another part of the frame. When the force is abruptly transferred from the first part to the second part of the bike, the resulting overload can cause the second part to break.
Due to the nature of bike crashes and impacts, it is impossible to predict exactly how forces will be absorbed or transferred. So for your safety, Trek recommends that Trek carbon fiber frames or forks NOT be repaired, by anyone.
Also note that a repair is a modification, and making a modification to the frame will void the warranty.
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