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by azernik
2878 days ago
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> I suppose in an extreme case the bar between the peddles and the back tire could just fall off, and a typical rider wouldn't notice it's missing until something bad happens. Even that is quite rare; that bar is an integral (usually welded) part of the frame. More common failure modes for frames are cracks (the tube comes loose in one point, usually close to a weld, and starts flopping around) or bottom bracket failure (pedal getting stuck or breaking loose). The more important skill for dealing with those is not memorizing the geometric structure of the frame, but knowing how to recognize early signs of wear (creaking in the frame, visible spreading hairline cracks, clicking when turning the pedals, etc.) Sidenote: This is a big drawback of carbon fiber composite bicycle parts - they're stronger per weight than metal, but they don't give a lot of warning before failing and said failures are usually more catastrophic (shattering rather than bending - see [1] for a video, and [2] for a more general discussion of the market for lemons that this creates). [1] https://www.youtube.com/watch?v=TxfJ-upYUXQ - note that this is a cheap part, so snapped under relatively low amounts of wear and force, but it was harder for the rider to realize this through inspection and riding before catastrophic failure [2] https://www.outsideonline.com/2311816/carbon-fiber-bike-acci... |
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