Disadvantages
- Heavier. Compared to a traditional diamond frame consisting of two near-triangles, alternative open or step-through frame designs of equivalent construction have been shown to be demonstrably less strong using finite element structural analysis. Consequently step-through frames must be made of substantially stronger sections to achieve similar overall strength, accomplished by thicker gauge tubing, the use of additional gusseting members, and/or monocoque frame construction, all of which add weight over a traditional diamond design.
- Reduced rigidity and frame life, unless reinforced. While a certain amount of vertical frame flexibility is desirable for a compliant ride on a bicycle with an unsuspended rear wheel, any lateral flexing or excessive vertical flex due to loss of the primary triangle can result in reduced frame life and a loss in pedaling efficiency.
- Fewer places to mount accessories, e.g. an air pump or water-bottle.
Read more about this topic: Step-through Frame