This is a misconception. Carbon fiber mountain bikes are not more delicate. Designed properly they are more durable. The idea that carbon fiber is innately delicate comes from road bikes designed to be as light and stiff as possible, and they can end up brittle, and weak in areas that don't normally see stresses. Not all road bikes are designed like this, even high end ones, but some early ultra light bikes were.Bikes that need to be durable use different types of fibers that can bend more before cracking, and may include layers of kevlar or other composites with more 'toughness' in key areas. My wife has a carbon fiber mountain bike and has been racing every weekend, winning, jumping, crashing, riding every day, for 3 years now, bike is fine.
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