Is it possible to change the tires on a rad mini from big fat tires too skinnier tires? Let's say going from the 4 inch Fat Tires to 2 inch or two and a half inch? I do zero trail riding, no beaches, no mountains. Just city streets and paved bike trails. It's something that could be done or something that I would want to do? I'm new to this and my bike will arrive in 3 days. Any comments or suggestions?