Some road bike users opt to use a narrower tire on the front wheel and a wider one on the rear for aerodynamics. This setting, which is often referred to as a “mullet” tire setup, is supposed to help in drag reduction through dynamic air flow management. On the other hand, the advantages may depend on the builder’s style and the user's goals. It is recommended to try this setup out before deciding whether to stick with it or find a more suitable arrangement for you since comfort and handling might be dependent on the tires used as well.