The final thesis analyzes the crack in the upper headset bearing cup of a carbon fiber mountain bike Specialized Enduro 2021. We were interested in finding out whether the cup's shape or the wrong choice and orientation of the carbon composite were to blame for its formation. For the analysis, we used the assumption of material homogeneity and performed it accordingly to bicycle safety standard tests. We used the Abaqus software and performed the analysis using the finite element method. The results indicate that bending stress in an axial direction is the most problematic for crack formation. The maximum stress is located elsewhere than the crack has formed and propagated. The crack has appeared due to the orientation of the carbon fibers.
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