Old 02-06-19, 10:41 AM
Join Date: Jun 2009
Location: Bainbridge Island, WA
Posts: 51

Bikes: Sachs, Alex Singer, Serotta, Raleigh Pro, Hetchins

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This is a great discussion and the point about carbon fiber in aircraft is important. Several of the modern business jets are 75-80% carbon fiber.

However, aircraft structures are (as noted) regularly inspected for cracking and failure, and the QA standards in manufacture are very high. One other distinction is that aircraft structures are loaded differently than bikes. Bikes have much greater concentration of loads than aircraft, particularly at the BB and headtube.

Even more important is mechanical damage. The idea that leaning on the bike at a rest stop could result in a "cracked top tube" is pretty unlikely, however the top tube is the place that a dropped wrench for example could hit and compromise the layup, resulting in a crack propagating from the site of the initial wound.

Mark Petry
Bainbridge Island, WA USA
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