The CB550F has a lighter four-into-one exhaust, slightly flatter handlebars, and a different fuel tank without chrome trim. The CB550F is part of the Honda Super Sport range, along with the CB400F,  an CB750F.
The CB550F has a modified exhaust setup, different handlebar angles, and an unadorned fuel tank compared to other models in the Honda Super Sport range. It is part of this series alongside the CB400F and the CB750F.